diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ApplyObjectMetrics.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ApplyObjectMetrics.java
index 78b6ddb..78745bb 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ApplyObjectMetrics.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ApplyObjectMetrics.java
@@ -26,25 +26,33 @@
 @Singleton
 public class ApplyObjectMetrics {
   private final Timer1<String> executionTime;
+  private final Timer1<String> end2EndTime;
 
   @Inject
   ApplyObjectMetrics(@PluginName String pluginName, MetricMaker metricMaker) {
-    Field<String> SOURCE_FIELD =
+    Field<String> field =
         Field.ofString(
-                "source",
+                "pull_replication",
                 (metadataBuilder, fieldValue) ->
                     metadataBuilder
                         .pluginName(pluginName)
-                        .addPluginMetadata(PluginMetadata.create("source", fieldValue)))
+                        .addPluginMetadata(PluginMetadata.create("pull_replication", fieldValue)))
             .build();
-
     executionTime =
         metricMaker.newTimer(
             "apply_object_latency",
             new Description("Time spent applying object from remote source.")
                 .setCumulative()
                 .setUnit(Description.Units.MILLISECONDS),
-            SOURCE_FIELD);
+            field);
+
+    end2EndTime =
+        metricMaker.newTimer(
+            "apply_object_end_2_end_latency",
+            new Description("Time spent for e2e replication with the apply object REST API")
+                .setCumulative()
+                .setUnit(Description.Units.MILLISECONDS),
+            field);
   }
 
   /**
@@ -56,4 +64,14 @@
   public Timer1.Context<String> start(String name) {
     return executionTime.start(name);
   }
+
+  /**
+   * Start the replication latency timer from a source.
+   *
+   * @param name the source name.
+   * @return the timer context.
+   */
+  public Timer1.Context<String> startEnd2End(String name) {
+    return end2EndTime.start(name);
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchAll.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchAll.java
index bcd86d7..42310ff 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchAll.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchAll.java
@@ -21,6 +21,7 @@
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
 import com.googlesource.gerrit.plugins.replication.ReplicationFilter;
+import java.util.Optional;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import org.eclipse.jgit.transport.URIish;
@@ -91,7 +92,7 @@
     for (Source cfg : sources.getAll()) {
       if (cfg.wouldFetchProject(project)) {
         for (URIish uri : cfg.getURIs(project, urlMatch)) {
-          cfg.schedule(project, FetchOne.ALL_REFS, uri, state, replicationType);
+          cfg.schedule(project, FetchOne.ALL_REFS, uri, state, replicationType, Optional.empty());
         }
       }
     }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
index 9b2f905..4fad8f9 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
@@ -32,6 +32,7 @@
 import com.google.gerrit.server.util.IdGenerator;
 import com.google.inject.Inject;
 import com.google.inject.assistedinject.Assisted;
+import com.googlesource.gerrit.plugins.replication.pull.api.PullReplicationApiRequestMetrics;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.Fetch;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.FetchFactory;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.RefUpdateState;
@@ -69,7 +70,8 @@
   static final String ID_KEY = "fetchOneId";
 
   interface Factory {
-    FetchOne create(Project.NameKey d, URIish u);
+    FetchOne create(
+        Project.NameKey d, URIish u, Optional<PullReplicationApiRequestMetrics> apiRequestMetrics);
   }
 
   private final GitRepositoryManager gitManager;
@@ -94,6 +96,7 @@
   private final FetchReplicationMetrics metrics;
   private final AtomicBoolean canceledWhileRunning;
   private final FetchFactory fetchFactory;
+  private final Optional<PullReplicationApiRequestMetrics> apiRequestMetrics;
 
   @Inject
   FetchOne(
@@ -106,7 +109,8 @@
       FetchReplicationMetrics m,
       FetchFactory fetchFactory,
       @Assisted Project.NameKey d,
-      @Assisted URIish u) {
+      @Assisted URIish u,
+      @Assisted Optional<PullReplicationApiRequestMetrics> apiRequestMetrics) {
     gitManager = grm;
     pool = s;
     config = c.getRemoteConfig();
@@ -122,6 +126,7 @@
     canceledWhileRunning = new AtomicBoolean(false);
     this.fetchFactory = fetchFactory;
     maxRetries = s.getMaxRetries();
+    this.apiRequestMetrics = apiRequestMetrics;
   }
 
   @Override
@@ -299,12 +304,17 @@
       git = gitManager.openRepository(projectName);
       runImpl();
       long elapsed = NANOSECONDS.toMillis(context.stop());
+      Optional<Long> elapsedEnd2End =
+          apiRequestMetrics
+              .flatMap(metrics -> metrics.stop(config.getName()))
+              .map(NANOSECONDS::toMillis);
       repLog.info(
-          "Replication from {} completed in {}ms, {}ms delay, {} retries",
+          "Replication from {} completed in {}ms, {}ms delay, {} retries{}",
           uri,
           elapsed,
           delay,
-          retryCount);
+          retryCount,
+          elapsedEnd2End.map(el -> String.format(", E2E %dms", el)).orElse(""));
     } catch (RepositoryNotFoundException e) {
       stateLog.error(
           "Cannot replicate " + projectName + "; Local repository error: " + e.getMessage(),
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchReplicationMetrics.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchReplicationMetrics.java
index e952252..22bb073 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchReplicationMetrics.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchReplicationMetrics.java
@@ -23,10 +23,12 @@
 import com.google.gerrit.server.logging.PluginMetadata;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
+import java.util.concurrent.TimeUnit;
 
 @Singleton
 public class FetchReplicationMetrics {
   private final Timer1<String> executionTime;
+  private final Timer1<String> end2EndExecutionTime;
   private final Histogram1<String> executionDelay;
   private final Histogram1<String> executionRetries;
 
@@ -34,11 +36,11 @@
   FetchReplicationMetrics(@PluginName String pluginName, MetricMaker metricMaker) {
     Field<String> SOURCE_FIELD =
         Field.ofString(
-                "source",
+                "pull_replication",
                 (metadataBuilder, fieldValue) ->
                     metadataBuilder
                         .pluginName(pluginName)
-                        .addPluginMetadata(PluginMetadata.create("source", fieldValue)))
+                        .addPluginMetadata(PluginMetadata.create("pull_replication", fieldValue)))
             .build();
 
     executionTime =
@@ -49,6 +51,14 @@
                 .setUnit(Description.Units.MILLISECONDS),
             SOURCE_FIELD);
 
+    end2EndExecutionTime =
+        metricMaker.newTimer(
+            "replication_end_2_end_latency",
+            new Description("Time spent end-2-end fetching from remote source.")
+                .setCumulative()
+                .setUnit(Description.Units.MILLISECONDS),
+            SOURCE_FIELD);
+
     executionDelay =
         metricMaker.newHistogram(
             "replication_delay",
@@ -77,6 +87,26 @@
   }
 
   /**
+   * Start the end-to-end replication latency timer from a source.
+   *
+   * @param name the source name.
+   * @return the timer context.
+   */
+  public Timer1.Context<String> startEnd2End(String name) {
+    return end2EndExecutionTime.start(name);
+  }
+
+  /**
+   * Record the end-to-end replication latency timer from a source.
+   *
+   * @param name the source name.
+   * @param metricNanos the timer value in nanos
+   */
+  public void recordEnd2End(String name, long metricNanos) {
+    end2EndExecutionTime.record(name, metricNanos, TimeUnit.NANOSECONDS);
+  }
+
+  /**
    * Record the replication delay and retry metrics for a source.
    *
    * @param name the source name.
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
index cfe01e2..f3e38fd 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueue.java
@@ -15,14 +15,17 @@
 package com.googlesource.gerrit.plugins.replication.pull;
 
 import com.google.auto.value.AutoValue;
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Queues;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.entities.Project.NameKey;
+import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.events.GitReferenceUpdatedListener;
 import com.google.gerrit.extensions.events.HeadUpdatedListener;
 import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.extensions.events.ProjectDeletedListener;
 import com.google.gerrit.extensions.registration.DynamicItem;
+import com.google.gerrit.metrics.Timer1.Context;
 import com.google.gerrit.server.events.EventDispatcher;
 import com.google.gerrit.server.git.WorkQueue;
 import com.google.inject.Inject;
@@ -36,7 +39,10 @@
 import com.googlesource.gerrit.plugins.replication.pull.filter.ExcludedRefsFilter;
 import java.io.IOException;
 import java.net.URISyntaxException;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Optional;
 import java.util.Queue;
 import java.util.Set;
@@ -46,7 +52,11 @@
 import java.util.concurrent.TimeoutException;
 import java.util.function.Consumer;
 import org.apache.http.client.ClientProtocolException;
+import org.eclipse.jgit.errors.CorruptObjectException;
+import org.eclipse.jgit.errors.IncorrectObjectTypeException;
 import org.eclipse.jgit.errors.InvalidObjectIdException;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.transport.URIish;
 import org.slf4j.Logger;
@@ -74,7 +84,9 @@
   private FetchApiClient.Factory fetchClientFactory;
   private Integer fetchCallsTimeout;
   private ExcludedRefsFilter refsFilter;
-  private RevisionReader revisionReader;
+  private Provider<RevisionReader> revReaderProvider;
+  private final ApplyObjectMetrics applyObjectMetrics;
+  private final FetchReplicationMetrics fetchMetrics;
 
   @Inject
   ReplicationQueue(
@@ -84,7 +96,9 @@
       ReplicationStateListeners sl,
       FetchApiClient.Factory fetchClientFactory,
       ExcludedRefsFilter refsFilter,
-      RevisionReader revReader) {
+      Provider<RevisionReader> revReaderProvider,
+      ApplyObjectMetrics applyObjectMetrics,
+      FetchReplicationMetrics fetchMetrics) {
     workQueue = wq;
     dispatcher = dis;
     sources = rd;
@@ -92,7 +106,9 @@
     beforeStartupEventsQueue = Queues.newConcurrentLinkedQueue();
     this.fetchClientFactory = fetchClientFactory;
     this.refsFilter = refsFilter;
-    this.revisionReader = revReader;
+    this.revReaderProvider = revReaderProvider;
+    this.applyObjectMetrics = applyObjectMetrics;
+    this.fetchMetrics = fetchMetrics;
   }
 
   @Override
@@ -225,9 +241,19 @@
     CallFunction call = getCallFunction(project, objectId, refName, isDelete, state);
 
     return (source) -> {
+      boolean callSuccessful;
       try {
-        call.call(source);
-      } catch (MissingParentObjectException e) {
+        callSuccessful = call.call(source);
+      } catch (Exception e) {
+        repLog.warn(
+            String.format(
+                "Failed to apply object %s on project %s:%s, falling back to git fetch",
+                objectId.name(), project, refName),
+            e);
+        callSuccessful = false;
+      }
+
+      if (!callSuccessful) {
         callFetch(source, project, refName, state);
       }
     };
@@ -244,10 +270,18 @@
     }
 
     try {
-      Optional<RevisionData> revisionData = revisionReader.read(project, objectId, refName);
+      Optional<RevisionData> revisionData =
+          revReaderProvider.get().read(project, objectId, refName, 0);
+      repLog.info(
+          "RevisionData is {} for {}:{}",
+          revisionData.map(RevisionData::toString).orElse("ABSENT"),
+          project,
+          refName);
+
       if (revisionData.isPresent()) {
         return ((source) ->
-            callSendObject(source, project, refName, isDelete, revisionData.get(), state));
+            callSendObject(
+                source, project, refName, isDelete, Arrays.asList(revisionData.get()), state));
       }
     } catch (InvalidObjectIdException | IOException e) {
       stateLog.error(
@@ -261,94 +295,189 @@
     return (source) -> callFetch(source, project, refName, state);
   }
 
-  private void callSendObject(
+  private boolean callSendObject(
       Source source,
       Project.NameKey project,
       String refName,
       boolean isDelete,
-      RevisionData revision,
+      List<RevisionData> revision,
       ReplicationState state)
       throws MissingParentObjectException {
+    boolean resultIsSuccessful = true;
     if (source.wouldFetchProject(project) && source.wouldFetchRef(refName)) {
       for (String apiUrl : source.getApis()) {
         try {
           URIish uri = new URIish(apiUrl);
           FetchApiClient fetchClient = fetchClientFactory.create(source);
+          repLog.info(
+              "Pull replication REST API apply object to {} for {}:{} - {}",
+              apiUrl,
+              project,
+              refName,
+              revision);
+          Context<String> apiTimer = applyObjectMetrics.startEnd2End(source.getRemoteConfigName());
+          HttpResult result =
+              isDelete
+                  ? fetchClient.callSendObject(project, refName, isDelete, null, uri)
+                  : fetchClient.callSendObjects(project, refName, revision, uri);
+          boolean resultSuccessful = result.isSuccessful();
+          repLog.info(
+              "Pull replication REST API apply object to {} COMPLETED for {}:{} - {}, HTTP Result:"
+                  + " {} - time:{} ms",
+              apiUrl,
+              project,
+              refName,
+              revision,
+              result,
+              apiTimer.stop() / 1000000.0);
 
-          HttpResult result = fetchClient.callSendObject(project, refName, isDelete, revision, uri);
-          if (isProjectMissing(result, project) && source.isCreateMissingRepositories()) {
+          if (!resultSuccessful
+              && result.isProjectMissing(project)
+              && source.isCreateMissingRepositories()) {
             result = initProject(project, uri, fetchClient, result);
+            repLog.info("Missing project {} created, HTTP Result:{}", project, result);
           }
-          if (!result.isSuccessful()) {
-            repLog.warn(
-                String.format(
-                    "Pull replication rest api apply object call failed. Endpoint url: %s, reason:%s",
-                    apiUrl, result.getMessage().orElse("unknown")));
+
+          if (!resultSuccessful) {
             if (result.isParentObjectMissing()) {
+
+              if (RefNames.isNoteDbMetaRef(refName) && revision.size() == 1) {
+                List<RevisionData> allRevisions =
+                    fetchWholeMetaHistory(project, refName, revision.get(0));
+                repLog.info(
+                    "Pull replication REST API apply object to {} for {}:{} - {}",
+                    apiUrl,
+                    project,
+                    refName,
+                    allRevisions);
+                return callSendObject(source, project, refName, isDelete, allRevisions, state);
+              }
+
               throw new MissingParentObjectException(
                   project, refName, source.getRemoteConfigName());
             }
           }
+
+          resultIsSuccessful &= resultSuccessful;
         } catch (URISyntaxException e) {
+          repLog.warn(
+              "Pull replication REST API apply object to {} *FAILED* for {}:{} - {}",
+              apiUrl,
+              project,
+              refName,
+              revision,
+              e);
           stateLog.error(String.format("Cannot parse pull replication api url:%s", apiUrl), state);
+          resultIsSuccessful = false;
         } catch (IOException e) {
+          repLog.warn(
+              "Pull replication REST API apply object to {} *FAILED* for {}:{} - {}",
+              apiUrl,
+              project,
+              refName,
+              revision,
+              e);
           stateLog.error(
               String.format(
-                  "Exception during the pull replication fetch rest api call. Endpoint url:%s, message:%s",
+                  "Exception during the pull replication fetch rest api call. Endpoint url:%s,"
+                      + " message:%s",
                   apiUrl, e.getMessage()),
               e,
               state);
+          resultIsSuccessful = false;
         }
       }
     }
+
+    return resultIsSuccessful;
   }
 
-  private void callFetch(
+  private List<RevisionData> fetchWholeMetaHistory(
+      NameKey project, String refName, RevisionData revision)
+      throws RepositoryNotFoundException, MissingObjectException, IncorrectObjectTypeException,
+          CorruptObjectException, IOException {
+    RevisionReader revisionReader = revReaderProvider.get();
+    Optional<RevisionData> revisionDataWithParents =
+        revisionReader.read(project, refName, Integer.MAX_VALUE);
+
+    ImmutableList.Builder<RevisionData> revisionDataBuilder = ImmutableList.builder();
+    List<ObjectId> parentObjectIds =
+        revisionDataWithParents
+            .map(RevisionData::getParentObjetIds)
+            .orElse(Collections.emptyList());
+    for (ObjectId parentObjectId : parentObjectIds) {
+      revisionReader.read(project, parentObjectId, refName, 0).ifPresent(revisionDataBuilder::add);
+    }
+
+    revisionDataBuilder.add(revision);
+
+    return revisionDataBuilder.build();
+  }
+
+  private boolean callFetch(
       Source source, Project.NameKey project, String refName, ReplicationState state) {
+    boolean resultIsSuccessful = true;
     if (source.wouldFetchProject(project) && source.wouldFetchRef(refName)) {
       for (String apiUrl : source.getApis()) {
         try {
           URIish uri = new URIish(apiUrl);
           FetchApiClient fetchClient = fetchClientFactory.create(source);
-          HttpResult result = fetchClient.callFetch(project, refName, uri);
-          if (isProjectMissing(result, project) && source.isCreateMissingRepositories()) {
+          repLog.info("Pull replication REST API fetch to {} for {}:{}", apiUrl, project, refName);
+          Context<String> timer = fetchMetrics.startEnd2End(source.getRemoteConfigName());
+          HttpResult result = fetchClient.callFetch(project, refName, uri, timer.getStartTime());
+          long elapsedMs = TimeUnit.NANOSECONDS.toMillis(timer.stop());
+          boolean resultSuccessful = result.isSuccessful();
+          repLog.info(
+              "Pull replication REST API fetch to {} COMPLETED for {}:{}, HTTP Result:"
+                  + " {} - time:{} ms",
+              apiUrl,
+              project,
+              refName,
+              result,
+              elapsedMs);
+          if (!resultSuccessful
+              && result.isProjectMissing(project)
+              && source.isCreateMissingRepositories()) {
             result = initProject(project, uri, fetchClient, result);
           }
-          if (!result.isSuccessful()) {
+          if (!resultSuccessful) {
             stateLog.warn(
                 String.format(
                     "Pull replication rest api fetch call failed. Endpoint url: %s, reason:%s",
                     apiUrl, result.getMessage().orElse("unknown")),
                 state);
           }
+
+          resultIsSuccessful &= result.isSuccessful();
         } catch (URISyntaxException e) {
           stateLog.error(String.format("Cannot parse pull replication api url:%s", apiUrl), state);
+          resultIsSuccessful = false;
         } catch (Exception e) {
           stateLog.error(
               String.format(
-                  "Exception during the pull replication fetch rest api call. Endpoint url:%s, message:%s",
+                  "Exception during the pull replication fetch rest api call. Endpoint url:%s,"
+                      + " message:%s",
                   apiUrl, e.getMessage()),
               e,
               state);
+          resultIsSuccessful = false;
         }
       }
     }
+
+    return resultIsSuccessful;
   }
 
   public boolean retry(int attempt, int maxRetries) {
     return maxRetries == 0 || attempt < maxRetries;
   }
 
-  private Boolean isProjectMissing(HttpResult result, Project.NameKey project) {
-    return !result.isSuccessful() && result.isProjectMissing(project);
-  }
-
   private HttpResult initProject(
       Project.NameKey project, URIish uri, FetchApiClient fetchClient, HttpResult result)
       throws IOException, ClientProtocolException {
     HttpResult initProjectResult = fetchClient.initProject(project, uri);
     if (initProjectResult.isSuccessful()) {
-      result = fetchClient.callFetch(project, "refs/*", uri);
+      result = fetchClient.callFetch(project, FetchOne.ALL_REFS, uri);
     } else {
       String errorMessage = initProjectResult.getMessage().map(e -> " - Error: " + e).orElse("");
       repLog.error("Cannot create project " + project + errorMessage);
@@ -399,6 +528,6 @@
 
   @FunctionalInterface
   private interface CallFunction {
-    void call(Source source) throws MissingParentObjectException;
+    boolean call(Source source) throws MissingParentObjectException;
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReader.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReader.java
index 468c5fc..db46b23 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReader.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReader.java
@@ -17,6 +17,7 @@
 import static com.googlesource.gerrit.plugins.replication.pull.PullReplicationLogger.repLog;
 
 import com.google.common.collect.Lists;
+import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.inject.Inject;
@@ -24,6 +25,9 @@
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionData;
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionObjectData;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.Optional;
 import org.eclipse.jgit.diff.DiffEntry;
@@ -36,6 +40,7 @@
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectLoader;
+import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.revwalk.RevCommit;
 import org.eclipse.jgit.revwalk.RevTree;
@@ -45,8 +50,11 @@
 public class RevisionReader {
   private static final String CONFIG_MAX_API_PAYLOAD_SIZE = "maxApiPayloadSize";
   private static final Long DEFAULT_MAX_PAYLOAD_SIZE_IN_BYTES = 10000L;
+  static final String CONFIG_MAX_API_HISTORY_DEPTH = "maxApiHistoryDepth";
+  private static final int DEFAULT_MAX_API_HISTORY_DEPTH = 128;
   private GitRepositoryManager gitRepositoryManager;
   private Long maxRefSize;
+  private final int maxDepth;
 
   @Inject
   public RevisionReader(GitRepositoryManager gitRepositoryManager, ReplicationConfig cfg) {
@@ -54,17 +62,49 @@
     this.maxRefSize =
         cfg.getConfig()
             .getLong("replication", CONFIG_MAX_API_PAYLOAD_SIZE, DEFAULT_MAX_PAYLOAD_SIZE_IN_BYTES);
+    this.maxDepth =
+        cfg.getConfig()
+            .getInt("replication", CONFIG_MAX_API_HISTORY_DEPTH, DEFAULT_MAX_API_HISTORY_DEPTH);
   }
 
-  public Optional<RevisionData> read(Project.NameKey project, ObjectId objectId, String refName)
+  public Optional<RevisionData> read(
+      Project.NameKey project, String refName, int maxParentObjectIds)
+      throws RepositoryNotFoundException, MissingObjectException, IncorrectObjectTypeException,
+          CorruptObjectException, IOException {
+    return read(project, null, refName, maxParentObjectIds);
+  }
+
+  public Optional<RevisionData> read(
+      Project.NameKey project,
+      @Nullable ObjectId refObjectId,
+      String refName,
+      int maxParentObjectIds)
       throws MissingObjectException, IncorrectObjectTypeException, CorruptObjectException,
           RepositoryNotFoundException, IOException {
     try (Repository git = gitRepositoryManager.openRepository(project)) {
       Long totalRefSize = 0l;
 
+      Ref ref = git.exactRef(refName);
+      if (ref == null) {
+        return Optional.empty();
+      }
+
+      ObjectId objectId = refObjectId == null ? ref.getObjectId() : refObjectId;
+
       ObjectLoader commitLoader = git.open(objectId);
       totalRefSize += commitLoader.getSize();
-      verifySize(totalRefSize, commitLoader);
+      verifySize(project, refName, objectId, totalRefSize, commitLoader);
+
+      if (commitLoader.getType() == Constants.OBJ_BLOB) {
+        return Optional.of(
+            new RevisionData(
+                Collections.emptyList(),
+                null,
+                null,
+                Arrays.asList(
+                    new RevisionObjectData(
+                        objectId.name(), Constants.OBJ_BLOB, commitLoader.getCachedBytes()))));
+      }
 
       if (commitLoader.getType() != Constants.OBJ_COMMIT) {
         repLog.trace(
@@ -77,28 +117,34 @@
 
       RevCommit commit = RevCommit.parse(commitLoader.getCachedBytes());
       RevisionObjectData commitRev =
-          new RevisionObjectData(commit.getType(), commitLoader.getCachedBytes());
+          new RevisionObjectData(objectId.name(), commit.getType(), commitLoader.getCachedBytes());
 
       RevTree tree = commit.getTree();
-      ObjectLoader treeLoader = git.open(commit.getTree().toObjectId());
+      ObjectId treeObjectId = commit.getTree().toObjectId();
+      ObjectLoader treeLoader = git.open(treeObjectId);
       totalRefSize += treeLoader.getSize();
-      verifySize(totalRefSize, treeLoader);
+      verifySize(project, refName, treeObjectId, totalRefSize, treeLoader);
 
       RevisionObjectData treeRev =
-          new RevisionObjectData(tree.getType(), treeLoader.getCachedBytes());
+          new RevisionObjectData(treeObjectId.name(), tree.getType(), treeLoader.getCachedBytes());
 
       List<RevisionObjectData> blobs = Lists.newLinkedList();
       try (TreeWalk walk = new TreeWalk(git)) {
         if (commit.getParentCount() > 0) {
           List<DiffEntry> diffEntries = readDiffs(git, commit, tree, walk);
-          blobs = readBlobs(git, totalRefSize, diffEntries);
+          blobs = readBlobs(project, refName, git, totalRefSize, diffEntries);
         } else {
           walk.setRecursive(true);
           walk.addTree(tree);
-          blobs = readBlobs(git, totalRefSize, walk);
+          blobs = readBlobs(project, refName, git, totalRefSize, walk);
         }
       }
-      return Optional.of(new RevisionData(commitRev, treeRev, blobs));
+
+      List<ObjectId> parentObjectIds =
+          getParentObjectIds(git, commit.getParents(), 0, Math.min(maxDepth, maxParentObjectIds));
+      Collections.reverse(parentObjectIds);
+
+      return Optional.of(new RevisionData(parentObjectIds, commitRev, treeRev, blobs));
     } catch (LargeObjectException e) {
       repLog.trace(
           "Ref {} size for project {} is greater than configured '{}'",
@@ -109,6 +155,32 @@
     }
   }
 
+  private List<ObjectId> getParentObjectIds(
+      Repository git, RevCommit[] commit, int parentsDepth, int maxParentObjectIds)
+      throws MissingObjectException, IncorrectObjectTypeException, IOException {
+    if (commit == null || commit.length == 0) {
+      return Collections.emptyList();
+    }
+
+    ArrayList<ObjectId> parentObjectIds = new ArrayList<>();
+    for (RevCommit revCommit : commit) {
+      if (parentsDepth < maxParentObjectIds) {
+        parentObjectIds.add(revCommit.getId());
+        parentsDepth++;
+
+        ObjectLoader ol = git.open(revCommit.getId(), Constants.OBJ_COMMIT);
+        RevCommit[] commitParents = RevCommit.parse(ol.getCachedBytes()).getParents();
+
+        List<ObjectId> nestedParentObjectIds =
+            getParentObjectIds(git, commitParents, parentsDepth, maxParentObjectIds);
+        parentObjectIds.addAll(nestedParentObjectIds);
+        parentsDepth += nestedParentObjectIds.size();
+      }
+    }
+
+    return parentObjectIds;
+  }
+
   private List<DiffEntry> readDiffs(Repository git, RevCommit commit, RevTree tree, TreeWalk walk)
       throws MissingObjectException, IncorrectObjectTypeException, CorruptObjectException,
           IOException {
@@ -117,7 +189,8 @@
     return DiffEntry.scan(walk, true);
   }
 
-  private List<RevisionObjectData> readBlobs(Repository git, Long totalRefSize, TreeWalk walk)
+  private List<RevisionObjectData> readBlobs(
+      Project.NameKey projectName, String refName, Repository git, Long totalRefSize, TreeWalk walk)
       throws MissingObjectException, IncorrectObjectTypeException, CorruptObjectException,
           IOException {
     List<RevisionObjectData> blobs = Lists.newLinkedList();
@@ -125,26 +198,33 @@
       ObjectId objectId = walk.getObjectId(0);
       ObjectLoader objectLoader = git.open(objectId);
       totalRefSize += objectLoader.getSize();
-      verifySize(totalRefSize, objectLoader);
+      verifySize(projectName, refName, objectId, totalRefSize, objectLoader);
 
       RevisionObjectData rev =
-          new RevisionObjectData(objectLoader.getType(), objectLoader.getCachedBytes());
+          new RevisionObjectData(
+              objectId.name(), objectLoader.getType(), objectLoader.getCachedBytes());
       blobs.add(rev);
     }
     return blobs;
   }
 
   private List<RevisionObjectData> readBlobs(
-      Repository git, Long totalRefSize, List<DiffEntry> diffEntries)
+      Project.NameKey projectName,
+      String refName,
+      Repository git,
+      Long totalRefSize,
+      List<DiffEntry> diffEntries)
       throws MissingObjectException, IOException {
     List<RevisionObjectData> blobs = Lists.newLinkedList();
     for (DiffEntry diffEntry : diffEntries) {
       if (!ChangeType.DELETE.equals(diffEntry.getChangeType())) {
-        ObjectLoader objectLoader = git.open(diffEntry.getNewId().toObjectId());
+        ObjectId diffObjectId = diffEntry.getNewId().toObjectId();
+        ObjectLoader objectLoader = git.open(diffObjectId);
         totalRefSize += objectLoader.getSize();
-        verifySize(totalRefSize, objectLoader);
+        verifySize(projectName, refName, diffObjectId, totalRefSize, objectLoader);
         RevisionObjectData rev =
-            new RevisionObjectData(objectLoader.getType(), objectLoader.getCachedBytes());
+            new RevisionObjectData(
+                diffObjectId.name(), objectLoader.getType(), objectLoader.getCachedBytes());
         blobs.add(rev);
       }
     }
@@ -159,9 +239,44 @@
     return parentCommit.getTree();
   }
 
-  private void verifySize(Long totalRefSize, ObjectLoader loader) throws LargeObjectException {
-    if (loader.isLarge() || totalRefSize > maxRefSize) {
-      throw new LargeObjectException();
+  private void verifySize(
+      Project.NameKey projectName,
+      String refName,
+      ObjectId objectId,
+      Long totalRefSize,
+      ObjectLoader loader)
+      throws LargeObjectException {
+    if (loader.isLarge()) {
+      repLog.warn(
+          "Objects associated with {}:{} ({}) are too big to fit into the object loader's memory",
+          projectName,
+          refName,
+          objectTypeToString(loader.getType()));
+      throw new LargeObjectException(objectId);
+    }
+
+    if (totalRefSize > maxRefSize) {
+      repLog.warn(
+          "Objects associated with {}:{} ({}) use {} bytes, over the maximum limit of {} bytes",
+          projectName,
+          refName,
+          objectTypeToString(loader.getType()),
+          totalRefSize,
+          maxRefSize);
+      throw new LargeObjectException(objectId);
+    }
+  }
+
+  private static String objectTypeToString(int type) {
+    switch (type) {
+      case Constants.OBJ_BLOB:
+        return "BLOB";
+      case Constants.OBJ_COMMIT:
+        return "COMMIT";
+      case Constants.OBJ_TREE:
+        return "TREE";
+      default:
+        return "type:" + type;
     }
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
index 71ec666..6bf4c21 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/Source.java
@@ -61,6 +61,7 @@
 import com.google.inject.servlet.RequestScoped;
 import com.googlesource.gerrit.plugins.replication.RemoteSiteUser;
 import com.googlesource.gerrit.plugins.replication.ReplicationFilter;
+import com.googlesource.gerrit.plugins.replication.pull.api.PullReplicationApiRequestMetrics;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.BatchFetchClient;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.CGitFetch;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.CGitFetchValidator;
@@ -392,9 +393,10 @@
       Project.NameKey project,
       String ref,
       ReplicationState state,
-      ReplicationType replicationType) {
+      ReplicationType replicationType,
+      Optional<PullReplicationApiRequestMetrics> apiRequestMetrics) {
     URIish uri = getURI(project);
-    return schedule(project, ref, uri, state, replicationType);
+    return schedule(project, ref, uri, state, replicationType, apiRequestMetrics);
   }
 
   public Future<?> schedule(
@@ -402,7 +404,8 @@
       String ref,
       URIish uri,
       ReplicationState state,
-      ReplicationType replicationType) {
+      ReplicationType replicationType,
+      Optional<PullReplicationApiRequestMetrics> apiRequestMetrics) {
 
     repLog.info("scheduling replication {}:{} => {}", uri, ref, project);
     if (!shouldReplicate(project, ref, state)) {
@@ -438,7 +441,7 @@
       FetchOne e = pending.get(uri);
       Future<?> f = CompletableFuture.completedFuture(null);
       if (e == null) {
-        e = opFactory.create(project, uri);
+        e = opFactory.create(project, uri, apiRequestMetrics);
         addRef(e, ref);
         e.addState(ref, state);
         pending.put(uri, e);
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/SourceConfigParser.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/SourceConfigParser.java
index 6dfed44..a8799c2 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/SourceConfigParser.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/SourceConfigParser.java
@@ -35,6 +35,7 @@
   /* (non-Javadoc)
    * @see com.googlesource.gerrit.plugins.replication.ConfigParser#parseRemotes(org.eclipse.jgit.lib.Config)
    */
+  @Override
   public List<RemoteConfiguration> parseRemotes(Config config) throws ConfigInvalidException {
 
     if (config.getSections().isEmpty()) {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectAction.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectAction.java
index 5132f41..04cc9e8 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectAction.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectAction.java
@@ -14,6 +14,8 @@
 
 package com.googlesource.gerrit.plugins.replication.pull.api;
 
+import static com.googlesource.gerrit.plugins.replication.pull.PullReplicationLogger.repLog;
+
 import com.google.common.base.Strings;
 import com.google.gerrit.extensions.restapi.AuthException;
 import com.google.gerrit.extensions.restapi.BadRequestException;
@@ -29,19 +31,20 @@
 import com.googlesource.gerrit.plugins.replication.pull.api.exception.RefUpdateException;
 import java.io.IOException;
 import java.util.Objects;
+import javax.servlet.http.HttpServletResponse;
 
 public class ApplyObjectAction implements RestModifyView<ProjectResource, RevisionInput> {
 
-  private final ApplyObjectCommand command;
+  private final ApplyObjectCommand applyObjectCommand;
   private final DeleteRefCommand deleteRefCommand;
   private final FetchPreconditions preConditions;
 
   @Inject
   public ApplyObjectAction(
-      ApplyObjectCommand command,
+      ApplyObjectCommand applyObjectCommand,
       DeleteRefCommand deleteRefCommand,
       FetchPreconditions preConditions) {
-    this.command = command;
+    this.applyObjectCommand = applyObjectCommand;
     this.deleteRefCommand = deleteRefCommand;
     this.preConditions = preConditions;
   }
@@ -50,42 +53,78 @@
   public Response<?> apply(ProjectResource resource, RevisionInput input) throws RestApiException {
 
     if (!preConditions.canCallFetchApi()) {
-      throw new AuthException("not allowed to call fetch command");
+      throw new AuthException("Not allowed to call fetch command");
     }
+    if (Strings.isNullOrEmpty(input.getLabel())) {
+      throw new BadRequestException("Source label cannot be null or empty");
+    }
+    if (Strings.isNullOrEmpty(input.getRefName())) {
+      throw new BadRequestException("Ref-update refname cannot be null or empty");
+    }
+
     try {
-      if (Strings.isNullOrEmpty(input.getLabel())) {
-        throw new BadRequestException("Source label cannot be null or empty");
-      }
-      if (Strings.isNullOrEmpty(input.getRefName())) {
-        throw new BadRequestException("Ref-update refname cannot be null or empty");
-      }
+      repLog.info(
+          "Apply object API from {} for {}:{} - {}",
+          resource.getNameKey(),
+          input.getLabel(),
+          input.getRefName(),
+          input.getRevisionData());
 
       if (Objects.isNull(input.getRevisionData())) {
         deleteRefCommand.deleteRef(resource.getNameKey(), input.getRefName(), input.getLabel());
-        return Response.created(input);
+        repLog.info(
+            "Apply object API - REF DELETED - from {} for {}:{} - {}",
+            resource.getNameKey(),
+            input.getLabel(),
+            input.getRefName(),
+            input.getRevisionData());
+        return Response.withStatusCode(HttpServletResponse.SC_NO_CONTENT, "");
       }
 
-      if (Objects.isNull(input.getRevisionData().getCommitObject())
-          || Objects.isNull(input.getRevisionData().getCommitObject().getContent())
-          || input.getRevisionData().getCommitObject().getContent().length == 0
-          || Objects.isNull(input.getRevisionData().getCommitObject().getType())) {
-        throw new BadRequestException("Ref-update commit object cannot be null or empty");
+      try {
+        input.validate();
+      } catch (IllegalArgumentException e) {
+        BadRequestException bre =
+            new BadRequestException("Ref-update with invalid input: " + e.getMessage(), e);
+        repLog.error(
+            "Apply object API *FAILED* from {} for {}:{} - {}",
+            input.getLabel(),
+            resource.getNameKey(),
+            input.getRefName(),
+            input.getRevisionData(),
+            bre);
+        throw bre;
       }
 
-      if (Objects.isNull(input.getRevisionData().getTreeObject())
-          || Objects.isNull(input.getRevisionData().getTreeObject().getContent())
-          || Objects.isNull(input.getRevisionData().getTreeObject().getType())) {
-        throw new BadRequestException("Ref-update tree object cannot be null");
-      }
-
-      command.applyObject(
+      applyObjectCommand.applyObject(
           resource.getNameKey(), input.getRefName(), input.getRevisionData(), input.getLabel());
       return Response.created(input);
     } catch (MissingParentObjectException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          input.getRevisionData(),
+          e);
       throw new ResourceConflictException(e.getMessage(), e);
     } catch (NumberFormatException | IOException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          input.getRevisionData(),
+          e);
       throw RestApiException.wrap(e.getMessage(), e);
     } catch (RefUpdateException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          input.getRevisionData(),
+          e);
       throw new UnprocessableEntityException(e.getMessage());
     }
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommand.java
index 276aa16..b27d8b7 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommand.java
@@ -37,6 +37,7 @@
 import com.googlesource.gerrit.plugins.replication.pull.fetch.ApplyObject;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.RefUpdateState;
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.Set;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.eclipse.jgit.transport.RefSpec;
@@ -70,12 +71,25 @@
   }
 
   public void applyObject(
-      Project.NameKey name, String refName, RevisionData revisionData, String sourceLabel)
+      Project.NameKey name, String refName, RevisionData revisionsData, String sourceLabel)
+      throws IOException, RefUpdateException, MissingParentObjectException {
+    applyObjects(name, refName, new RevisionData[] {revisionsData}, sourceLabel);
+  }
+
+  public void applyObjects(
+      Project.NameKey name, String refName, RevisionData[] revisionsData, String sourceLabel)
       throws IOException, RefUpdateException, MissingParentObjectException {
 
-    repLog.info("Apply object from {} for project {}, ref name {}", sourceLabel, name, refName);
+    repLog.info(
+        "Apply object from {} for {}:{} - {}",
+        sourceLabel,
+        name,
+        refName,
+        Arrays.toString(revisionsData));
     Timer1.Context<String> context = metrics.start(sourceLabel);
-    RefUpdateState refUpdateState = applyObject.apply(name, new RefSpec(refName), revisionData);
+
+    RefUpdateState refUpdateState = applyObject.apply(name, new RefSpec(refName), revisionsData);
+
     long elapsed = NANOSECONDS.toMillis(context.stop());
 
     try {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectsAction.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectsAction.java
new file mode 100644
index 0000000..a1e1f5b
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectsAction.java
@@ -0,0 +1,131 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull.api;
+
+import static com.googlesource.gerrit.plugins.replication.pull.PullReplicationLogger.repLog;
+
+import com.google.common.base.Strings;
+import com.google.gerrit.extensions.restapi.AuthException;
+import com.google.gerrit.extensions.restapi.BadRequestException;
+import com.google.gerrit.extensions.restapi.ResourceConflictException;
+import com.google.gerrit.extensions.restapi.Response;
+import com.google.gerrit.extensions.restapi.RestApiException;
+import com.google.gerrit.extensions.restapi.RestModifyView;
+import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
+import com.google.gerrit.server.project.ProjectResource;
+import com.google.inject.Inject;
+import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionsInput;
+import com.googlesource.gerrit.plugins.replication.pull.api.exception.MissingParentObjectException;
+import com.googlesource.gerrit.plugins.replication.pull.api.exception.RefUpdateException;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Objects;
+import javax.servlet.http.HttpServletResponse;
+
+public class ApplyObjectsAction implements RestModifyView<ProjectResource, RevisionsInput> {
+
+  private final ApplyObjectCommand command;
+  private final DeleteRefCommand deleteRefCommand;
+  private final FetchPreconditions preConditions;
+
+  @Inject
+  public ApplyObjectsAction(
+      ApplyObjectCommand command,
+      DeleteRefCommand deleteRefCommand,
+      FetchPreconditions preConditions) {
+    this.command = command;
+    this.deleteRefCommand = deleteRefCommand;
+    this.preConditions = preConditions;
+  }
+
+  @Override
+  public Response<?> apply(ProjectResource resource, RevisionsInput input) throws RestApiException {
+    if (!preConditions.canCallFetchApi()) {
+      throw new AuthException("not allowed to call fetch command");
+    }
+
+    try {
+      if (Strings.isNullOrEmpty(input.getLabel())) {
+        throw new BadRequestException("Source label cannot be null or empty");
+      }
+      if (Strings.isNullOrEmpty(input.getRefName())) {
+        throw new BadRequestException("Ref-update refname cannot be null or empty");
+      }
+
+      repLog.info(
+          "Apply object API from {} for {}:{} - {}",
+          resource.getNameKey(),
+          input.getLabel(),
+          input.getRefName(),
+          Arrays.toString(input.getRevisionsData()));
+
+      if (Objects.isNull(input.getRevisionsData())) {
+        deleteRefCommand.deleteRef(resource.getNameKey(), input.getRefName(), input.getLabel());
+        repLog.info(
+            "Apply object API - REF DELETED - from {} for {}:{}",
+            resource.getNameKey(),
+            input.getLabel(),
+            input.getRefName());
+        return Response.withStatusCode(HttpServletResponse.SC_NO_CONTENT, "");
+      }
+
+      try {
+        input.validate();
+      } catch (IllegalArgumentException e) {
+        BadRequestException bre =
+            new BadRequestException("Ref-update with invalid input: " + e.getMessage(), e);
+        repLog.error(
+            "Apply object API *FAILED* from {} for {}:{} - {}",
+            input.getLabel(),
+            resource.getNameKey(),
+            input.getRefName(),
+            Arrays.toString(input.getRevisionsData()),
+            bre);
+        throw bre;
+      }
+
+      command.applyObjects(
+          resource.getNameKey(), input.getRefName(), input.getRevisionsData(), input.getLabel());
+      return Response.created(input);
+    } catch (MissingParentObjectException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          Arrays.toString(input.getRevisionsData()),
+          e);
+      throw new ResourceConflictException(e.getMessage(), e);
+    } catch (NumberFormatException | IOException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          Arrays.toString(input.getRevisionsData()),
+          e);
+      throw RestApiException.wrap(e.getMessage(), e);
+    } catch (RefUpdateException e) {
+      repLog.error(
+          "Apply object API *FAILED* from {} for {}:{} - {}",
+          input.getLabel(),
+          resource.getNameKey(),
+          input.getRefName(),
+          Arrays.toString(input.getRevisionsData()),
+          e);
+      throw new UnprocessableEntityException(e.getMessage());
+    }
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
index 0c5e016..2a3a79d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommand.java
@@ -19,41 +19,52 @@
 import com.google.common.flogger.FluentLogger;
 import com.google.gerrit.entities.Project;
 import com.google.gerrit.extensions.registration.DynamicItem;
-import com.google.gerrit.extensions.restapi.ResourceConflictException;
 import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
 import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.server.events.EventDispatcher;
+import com.google.gerrit.server.git.LocalDiskRepositoryManager;
+import com.google.gerrit.server.permissions.PermissionBackend;
 import com.google.gerrit.server.permissions.PermissionBackendException;
+import com.google.gerrit.server.permissions.RefPermission;
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.gerrit.server.project.ProjectState;
-import com.google.gerrit.server.restapi.project.DeleteRef;
 import com.google.inject.Inject;
 import com.googlesource.gerrit.plugins.replication.pull.Context;
 import com.googlesource.gerrit.plugins.replication.pull.FetchRefReplicatedEvent;
 import com.googlesource.gerrit.plugins.replication.pull.PullReplicationStateLogger;
 import com.googlesource.gerrit.plugins.replication.pull.ReplicationState;
+import com.googlesource.gerrit.plugins.replication.pull.fetch.ApplyObject;
+import com.googlesource.gerrit.plugins.replication.pull.fetch.RefUpdateState;
 import java.io.IOException;
 import java.util.Optional;
+import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.Repository;
 
 public class DeleteRefCommand {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
 
   private final PullReplicationStateLogger fetchStateLog;
-  private final DeleteRef deleteRef;
+  private final ApplyObject applyObject;
   private final DynamicItem<EventDispatcher> eventDispatcher;
   private final ProjectCache projectCache;
+  private final PermissionBackend permissionBackend;
+  private final LocalDiskRepositoryManager gitManager;
 
   @Inject
   public DeleteRefCommand(
       PullReplicationStateLogger fetchStateLog,
       ProjectCache projectCache,
-      DeleteRef deleteRef,
-      DynamicItem<EventDispatcher> eventDispatcher) {
+      ApplyObject applyObject,
+      PermissionBackend permissionBackend,
+      DynamicItem<EventDispatcher> eventDispatcher,
+      LocalDiskRepositoryManager gitManager) {
     this.fetchStateLog = fetchStateLog;
     this.projectCache = projectCache;
-    this.deleteRef = deleteRef;
+    this.applyObject = applyObject;
     this.eventDispatcher = eventDispatcher;
+    this.permissionBackend = permissionBackend;
+    this.gitManager = gitManager;
   }
 
   public void deleteRef(Project.NameKey name, String refName, String sourceLabel)
@@ -66,8 +77,15 @@
       }
 
       try {
+        projectState.get().checkStatePermitsWrite();
+        permissionBackend
+            .currentUser()
+            .project(projectState.get().getNameKey())
+            .ref(refName)
+            .check(RefPermission.DELETE);
+
         Context.setLocalEvent(true);
-        deleteRef.deleteSingleRef(projectState.get(), refName);
+        deleteRef(name, refName);
 
         eventDispatcher
             .get()
@@ -83,7 +101,7 @@
             "Unexpected error while trying to delete ref '%s' on project %s and notifying it",
             refName, name);
         throw RestApiException.wrap(e.getMessage(), e);
-      } catch (ResourceConflictException e) {
+      } catch (IOException e) {
         eventDispatcher
             .get()
             .postEvent(
@@ -110,4 +128,18 @@
       throw RestApiException.wrap(e.getMessage(), e);
     }
   }
+
+  private RefUpdateState deleteRef(Project.NameKey name, String refName) throws IOException {
+
+    try (Repository repository = gitManager.openRepository(name)) {
+      RefUpdate.Result result;
+      RefUpdate u = repository.updateRef(refName);
+      u.setExpectedOldObjectId(repository.exactRef(refName).getObjectId());
+      u.setNewObjectId(ObjectId.zeroId());
+      u.setForceUpdate(true);
+
+      result = u.delete();
+      return new RefUpdateState(refName, result);
+    }
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchAction.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchAction.java
index 2c9583a..fdb4f8f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchAction.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchAction.java
@@ -104,7 +104,10 @@
     @SuppressWarnings("unchecked")
     WorkQueue.Task<Void> task =
         (WorkQueue.Task<Void>)
-            workQueue.getDefaultQueue().submit(fetchJobFactory.create(project, input));
+            workQueue
+                .getDefaultQueue()
+                .submit(
+                    fetchJobFactory.create(project, input, PullReplicationApiRequestMetrics.get()));
     Optional<String> url =
         urlFormatter
             .get()
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommand.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommand.java
index e1ac9ac..3a502ef 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommand.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommand.java
@@ -54,19 +54,28 @@
     this.eventDispatcher = eventDispatcher;
   }
 
-  public void fetchAsync(Project.NameKey name, String label, String refName)
+  public void fetchAsync(
+      Project.NameKey name,
+      String label,
+      String refName,
+      PullReplicationApiRequestMetrics apiRequestMetrics)
       throws InterruptedException, ExecutionException, RemoteConfigurationMissingException,
           TimeoutException {
-    fetch(name, label, refName, ASYNC);
+    fetch(name, label, refName, ASYNC, Optional.of(apiRequestMetrics));
   }
 
   public void fetchSync(Project.NameKey name, String label, String refName)
       throws InterruptedException, ExecutionException, RemoteConfigurationMissingException,
           TimeoutException {
-    fetch(name, label, refName, SYNC);
+    fetch(name, label, refName, SYNC, Optional.empty());
   }
 
-  private void fetch(Project.NameKey name, String label, String refName, ReplicationType fetchType)
+  private void fetch(
+      Project.NameKey name,
+      String label,
+      String refName,
+      ReplicationType fetchType,
+      Optional<PullReplicationApiRequestMetrics> apiRequestMetrics)
       throws InterruptedException, ExecutionException, RemoteConfigurationMissingException,
           TimeoutException {
     ReplicationState state =
@@ -82,7 +91,7 @@
 
     try {
       state.markAllFetchTasksScheduled();
-      Future<?> future = source.get().schedule(name, refName, state, fetchType);
+      Future<?> future = source.get().schedule(name, refName, state, fetchType, apiRequestMetrics);
       future.get(source.get().getTimeout(), TimeUnit.SECONDS);
     } catch (ExecutionException
         | IllegalStateException
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchJob.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchJob.java
index f533734..9478d5c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchJob.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchJob.java
@@ -26,25 +26,31 @@
   private static final FluentLogger log = FluentLogger.forEnclosingClass();
 
   public interface Factory {
-    FetchJob create(Project.NameKey project, FetchAction.Input input);
+    FetchJob create(
+        Project.NameKey project, FetchAction.Input input, PullReplicationApiRequestMetrics metrics);
   }
 
   private FetchCommand command;
   private Project.NameKey project;
   private FetchAction.Input input;
+  private final PullReplicationApiRequestMetrics metrics;
 
   @Inject
   public FetchJob(
-      FetchCommand command, @Assisted Project.NameKey project, @Assisted FetchAction.Input input) {
+      FetchCommand command,
+      @Assisted Project.NameKey project,
+      @Assisted FetchAction.Input input,
+      PullReplicationApiRequestMetrics metrics) {
     this.command = command;
     this.project = project;
     this.input = input;
+    this.metrics = metrics;
   }
 
   @Override
   public void run() {
     try {
-      command.fetchAsync(project, input.label, input.refName);
+      command.fetchAsync(project, input.label, input.refName, metrics);
     } catch (InterruptedException
         | ExecutionException
         | RemoteConfigurationMissingException
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/HttpModule.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/HttpModule.java
index b2ef28d..b140cb4 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/HttpModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/HttpModule.java
@@ -38,5 +38,9 @@
     } else {
       serveRegex("/init-project/.*$").with(ProjectInitializationAction.class);
     }
+
+    DynamicSet.bind(binder(), AllRequestFilter.class)
+        .to(PullReplicationApiMetricsFilter.class)
+        .in(Scopes.SINGLETON);
   }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiMetricsFilter.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiMetricsFilter.java
new file mode 100644
index 0000000..3858db2
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiMetricsFilter.java
@@ -0,0 +1,53 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull.api;
+
+import com.google.gerrit.httpd.AllRequestFilter;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.Singleton;
+import java.io.IOException;
+import javax.servlet.FilterChain;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@Singleton
+public class PullReplicationApiMetricsFilter extends AllRequestFilter {
+  private final Provider<PullReplicationApiRequestMetrics> apiRequestMetrics;
+
+  @Inject
+  public PullReplicationApiMetricsFilter(
+      Provider<PullReplicationApiRequestMetrics> apiRequestMetrics) {
+    this.apiRequestMetrics = apiRequestMetrics;
+  }
+
+  @Override
+  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+      throws IOException, ServletException {
+    if (!(request instanceof HttpServletRequest) || !(response instanceof HttpServletResponse)) {
+      chain.doFilter(request, response);
+      return;
+    }
+
+    PullReplicationApiRequestMetrics requestMetrics = apiRequestMetrics.get();
+    requestMetrics.start((HttpServletRequest) request);
+    PullReplicationApiRequestMetrics.set(requestMetrics);
+
+    chain.doFilter(request, response);
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiModule.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiModule.java
index e7b3a7f..d1d28a6 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiModule.java
@@ -31,6 +31,7 @@
     bind(UpdateHeadAction.class).in(Scopes.SINGLETON);
     post(PROJECT_KIND, "fetch").to(FetchAction.class);
     post(PROJECT_KIND, "apply-object").to(ApplyObjectAction.class);
+    post(PROJECT_KIND, "apply-objects").to(ApplyObjectsAction.class);
     delete(PROJECT_KIND, "delete-project").to(ProjectDeletionAction.class);
     put(PROJECT_KIND, "HEAD").to(UpdateHeadAction.class);
 
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiRequestMetrics.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiRequestMetrics.java
new file mode 100644
index 0000000..8e4e43f
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationApiRequestMetrics.java
@@ -0,0 +1,82 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull.api;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import com.google.gerrit.server.events.Event;
+import com.google.inject.Inject;
+import com.googlesource.gerrit.plugins.replication.pull.FetchReplicationMetrics;
+import java.util.Optional;
+import java.util.concurrent.atomic.AtomicBoolean;
+import javax.servlet.http.HttpServletRequest;
+
+public class PullReplicationApiRequestMetrics {
+  private static final ThreadLocal<PullReplicationApiRequestMetrics> localApiRequestMetrics =
+      new ThreadLocal<>();
+
+  public static final String HTTP_HEADER_X_START_TIME_NANOS = "X-StartTimeNanos";
+
+  private Optional<Long> startTimeNanos = Optional.empty();
+  private final AtomicBoolean initialised = new AtomicBoolean();
+  private final FetchReplicationMetrics metrics;
+
+  public static PullReplicationApiRequestMetrics get() {
+    return localApiRequestMetrics.get();
+  }
+
+  public static void set(PullReplicationApiRequestMetrics metrics) {
+    localApiRequestMetrics.set(metrics);
+  }
+
+  @Inject
+  public PullReplicationApiRequestMetrics(FetchReplicationMetrics metrics) {
+    this.metrics = metrics;
+  }
+
+  public void start(HttpServletRequest req) {
+    if (!initialised.compareAndSet(false, true)) {
+      throw new IllegalStateException("PullReplicationApiRequestMetrics already initialised");
+    }
+
+    startTimeNanos =
+        Optional.ofNullable(req.getHeader(HTTP_HEADER_X_START_TIME_NANOS))
+            .map(Long::parseLong)
+            /* Adjust with the system's nanotime for preventing negative execution times
+             * due to a clock skew between the client and the server timestamp.
+             */
+            .map(nanoTime -> Math.min(currentTimeNanos(), nanoTime));
+  }
+
+  public void start(Event event) {
+    if (!initialised.compareAndSet(false, true)) {
+      throw new IllegalStateException("PullReplicationApiRequestMetrics already initialised");
+    }
+    startTimeNanos = Optional.of(event.eventCreatedOn * 1000 * 1000 * 1000);
+  }
+
+  public Optional<Long> stop(String replicationSourceName) {
+    return startTimeNanos.map(
+        start -> {
+          long elapsed = currentTimeNanos() - start;
+          metrics.recordEnd2End(replicationSourceName, elapsed);
+          return elapsed;
+        });
+  }
+
+  private long currentTimeNanos() {
+    return MILLISECONDS.toNanos(System.currentTimeMillis());
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationFilter.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationFilter.java
index 4af2bf7..0a9b266 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationFilter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/PullReplicationFilter.java
@@ -55,6 +55,7 @@
 import com.google.inject.TypeLiteral;
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchAction.Input;
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionInput;
+import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionsInput;
 import com.googlesource.gerrit.plugins.replication.pull.api.exception.InitProjectException;
 import java.io.BufferedReader;
 import java.io.EOFException;
@@ -75,6 +76,7 @@
 
   private FetchAction fetchAction;
   private ApplyObjectAction applyObjectAction;
+  private ApplyObjectsAction applyObjectsAction;
   private ProjectInitializationAction projectInitializationAction;
   private UpdateHeadAction updateHEADAction;
   private ProjectDeletionAction projectDeletionAction;
@@ -87,6 +89,7 @@
   public PullReplicationFilter(
       FetchAction fetchAction,
       ApplyObjectAction applyObjectAction,
+      ApplyObjectsAction applyObjectsAction,
       ProjectInitializationAction projectInitializationAction,
       UpdateHeadAction updateHEADAction,
       ProjectDeletionAction projectDeletionAction,
@@ -95,6 +98,7 @@
       @PluginName String pluginName) {
     this.fetchAction = fetchAction;
     this.applyObjectAction = applyObjectAction;
+    this.applyObjectsAction = applyObjectsAction;
     this.projectInitializationAction = projectInitializationAction;
     this.updateHEADAction = updateHEADAction;
     this.projectDeletionAction = projectDeletionAction;
@@ -127,6 +131,12 @@
         } else {
           httpResponse.sendError(SC_UNAUTHORIZED);
         }
+      } else if (isApplyObjectsAction(httpRequest)) {
+        if (userProvider.get().isIdentifiedUser()) {
+          writeResponse(httpResponse, doApplyObjects(httpRequest));
+        } else {
+          httpResponse.sendError(SC_UNAUTHORIZED);
+        }
       } else if (isInitProjectAction(httpRequest)) {
         if (userProvider.get().isIdentifiedUser()) {
           if (!checkAcceptHeader(httpRequest, httpResponse)) {
@@ -199,6 +209,16 @@
   }
 
   @SuppressWarnings("unchecked")
+  private Response<Map<String, Object>> doApplyObjects(HttpServletRequest httpRequest)
+      throws RestApiException, IOException, PermissionBackendException {
+    RevisionsInput input = readJson(httpRequest, TypeLiteral.get(RevisionsInput.class));
+    IdString id = getProjectName(httpRequest);
+    ProjectResource projectResource = projectsCollection.parse(TopLevelResource.INSTANCE, id);
+
+    return (Response<Map<String, Object>>) applyObjectsAction.apply(projectResource, input);
+  }
+
+  @SuppressWarnings("unchecked")
   private Response<String> doUpdateHEAD(HttpServletRequest httpRequest) throws Exception {
     HeadInput input = readJson(httpRequest, TypeLiteral.get(HeadInput.class));
     ProjectResource projectResource =
@@ -293,6 +313,10 @@
     return httpRequest.getRequestURI().endsWith("pull-replication~apply-object");
   }
 
+  private boolean isApplyObjectsAction(HttpServletRequest httpRequest) {
+    return httpRequest.getRequestURI().endsWith("pull-replication~apply-objects");
+  }
+
   private boolean isFetchAction(HttpServletRequest httpRequest) {
     return httpRequest.getRequestURI().endsWith("pull-replication~fetch");
   }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionData.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionData.java
index bcd4e05..ffe98da 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionData.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionData.java
@@ -15,8 +15,11 @@
 package com.googlesource.gerrit.plugins.replication.pull.api.data;
 
 import java.util.List;
+import org.eclipse.jgit.lib.ObjectId;
 
 public class RevisionData {
+  private transient List<ObjectId> parentObjectIds;
+
   private RevisionObjectData commitObject;
 
   private RevisionObjectData treeObject;
@@ -24,14 +27,20 @@
   private List<RevisionObjectData> blobs;
 
   public RevisionData(
+      List<ObjectId> parentObjectIds,
       RevisionObjectData commitObject,
       RevisionObjectData treeObject,
       List<RevisionObjectData> blobs) {
+    this.parentObjectIds = parentObjectIds;
     this.commitObject = commitObject;
     this.treeObject = treeObject;
     this.blobs = blobs;
   }
 
+  public List<ObjectId> getParentObjetIds() {
+    return parentObjectIds;
+  }
+
   public RevisionObjectData getCommitObject() {
     return commitObject;
   }
@@ -43,4 +52,15 @@
   public List<RevisionObjectData> getBlobs() {
     return blobs;
   }
+
+  @Override
+  public String toString() {
+    return "{"
+        + (commitObject != null ? "commitObject=" + commitObject : "")
+        + " "
+        + (treeObject != null ? "treeObject=" + treeObject : "")
+        + " "
+        + (blobs != null && !blobs.isEmpty() ? "blobs=" + blobs : "")
+        + "}";
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionInput.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionInput.java
index bc3e218..c18e11d 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionInput.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionInput.java
@@ -14,6 +14,10 @@
 
 package com.googlesource.gerrit.plugins.replication.pull.api.data;
 
+import java.util.List;
+import java.util.Objects;
+import org.eclipse.jgit.lib.Constants;
+
 public class RevisionInput {
   private String label;
 
@@ -38,4 +42,44 @@
   public RevisionData getRevisionData() {
     return revisionData;
   }
+
+  public void validate() {
+    validate(refName, revisionData);
+  }
+
+  static void validate(String refName, RevisionData revisionData) {
+    // Non-heads refs can point to non-commit objects
+    if (!refName.startsWith(Constants.R_HEADS)
+        && Objects.isNull(revisionData.getCommitObject())
+        && Objects.isNull(revisionData.getTreeObject())) {
+
+      List<RevisionObjectData> blobs = revisionData.getBlobs();
+
+      if (Objects.isNull(blobs) || blobs.isEmpty()) {
+        throw new IllegalArgumentException(
+            "Ref " + refName + " cannot have a null or empty list of BLOBs associated");
+      }
+
+      if (blobs.size() > 1) {
+        throw new IllegalArgumentException("Ref " + refName + " has more than one BLOB associated");
+      }
+
+      return;
+    }
+
+    if (Objects.isNull(revisionData.getCommitObject())
+        || Objects.isNull(revisionData.getCommitObject().getContent())
+        || revisionData.getCommitObject().getContent().length == 0
+        || Objects.isNull(revisionData.getCommitObject().getType())) {
+      throw new IllegalArgumentException(
+          "Commit object for ref " + refName + " cannot be null or empty");
+    }
+
+    if (Objects.isNull(revisionData.getTreeObject())
+        || Objects.isNull(revisionData.getTreeObject().getContent())
+        || Objects.isNull(revisionData.getTreeObject().getType())) {
+      throw new IllegalArgumentException(
+          "Ref-update tree object for ref " + refName + " cannot be null");
+    }
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionObjectData.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionObjectData.java
index 02ba06c..b21f495 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionObjectData.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionObjectData.java
@@ -15,12 +15,15 @@
 package com.googlesource.gerrit.plugins.replication.pull.api.data;
 
 import java.util.Base64;
+import org.eclipse.jgit.lib.Constants;
 
 public class RevisionObjectData {
+  private final String sha1;
   private final Integer type;
   private final String content;
 
-  public RevisionObjectData(int type, byte[] content) {
+  public RevisionObjectData(String sha1, int type, byte[] content) {
+    this.sha1 = sha1;
     this.type = type;
     this.content = content == null ? "" : Base64.getEncoder().encodeToString(content);
   }
@@ -32,4 +35,29 @@
   public byte[] getContent() {
     return Base64.getDecoder().decode(content);
   }
+
+  public String getSha1() {
+    return sha1;
+  }
+
+  @Override
+  public String toString() {
+    String typeStr;
+    switch (type) {
+      case Constants.OBJ_BLOB:
+        typeStr = "BLOB";
+        break;
+      case Constants.OBJ_COMMIT:
+        typeStr = "COMMIT";
+        break;
+      case Constants.OBJ_TREE:
+        typeStr = "TREE";
+        break;
+      default:
+        typeStr = "type:" + type;
+        break;
+    }
+
+    return sha1 + " (" + typeStr + ")";
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionsInput.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionsInput.java
new file mode 100644
index 0000000..2361f6b
--- /dev/null
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/api/data/RevisionsInput.java
@@ -0,0 +1,60 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull.api.data;
+
+import java.util.Arrays;
+
+public class RevisionsInput {
+  private String label;
+
+  private String refName;
+
+  private RevisionData[] revisionsData;
+
+  public RevisionsInput(String label, String refName, RevisionData[] revisionsData) {
+    this.label = label;
+    this.refName = refName;
+    this.revisionsData = revisionsData;
+  }
+
+  public String getLabel() {
+    return label;
+  }
+
+  public String getRefName() {
+    return refName;
+  }
+
+  public RevisionData[] getRevisionsData() {
+    return revisionsData;
+  }
+
+  public void validate() {
+    for (RevisionData revisionData : revisionsData) {
+      RevisionInput.validate(refName, revisionData);
+    }
+  }
+
+  @Override
+  public String toString() {
+    return "RevisionsInput { "
+        + label
+        + ":"
+        + refName
+        + " - "
+        + Arrays.toString(revisionsData)
+        + "}";
+  }
+}
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchApiClient.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchApiClient.java
index 476a35b..6000eb9 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchApiClient.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchApiClient.java
@@ -14,10 +14,13 @@
 
 package com.googlesource.gerrit.plugins.replication.pull.client;
 
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
 import com.google.gerrit.entities.Project;
 import com.googlesource.gerrit.plugins.replication.pull.Source;
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionData;
 import java.io.IOException;
+import java.util.List;
 import org.apache.http.client.ClientProtocolException;
 import org.eclipse.jgit.transport.URIish;
 
@@ -27,9 +30,15 @@
     FetchApiClient create(Source source);
   }
 
-  HttpResult callFetch(Project.NameKey project, String refName, URIish targetUri)
+  HttpResult callFetch(
+      Project.NameKey project, String refName, URIish targetUri, long startTimeNanos)
       throws ClientProtocolException, IOException;
 
+  default HttpResult callFetch(Project.NameKey project, String refName, URIish targetUri)
+      throws ClientProtocolException, IOException {
+    return callFetch(project, refName, targetUri, MILLISECONDS.toNanos(System.currentTimeMillis()));
+  }
+
   HttpResult initProject(Project.NameKey project, URIish uri) throws IOException;
 
   HttpResult deleteProject(Project.NameKey project, URIish apiUri) throws IOException;
@@ -43,4 +52,8 @@
       RevisionData revisionData,
       URIish targetUri)
       throws ClientProtocolException, IOException;
+
+  HttpResult callSendObjects(
+      Project.NameKey project, String refName, List<RevisionData> revisionData, URIish targetUri)
+      throws ClientProtocolException, IOException;
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClient.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClient.java
index f1d486d..9b33c81 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClient.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClient.java
@@ -23,6 +23,7 @@
 import com.google.common.net.MediaType;
 import com.google.gerrit.common.Nullable;
 import com.google.gerrit.entities.Project;
+import com.google.gerrit.entities.Project.NameKey;
 import com.google.gerrit.extensions.annotations.PluginName;
 import com.google.gerrit.extensions.restapi.Url;
 import com.google.gerrit.server.config.GerritInstanceId;
@@ -33,11 +34,14 @@
 import com.googlesource.gerrit.plugins.replication.CredentialsFactory;
 import com.googlesource.gerrit.plugins.replication.ReplicationConfig;
 import com.googlesource.gerrit.plugins.replication.pull.Source;
+import com.googlesource.gerrit.plugins.replication.pull.api.PullReplicationApiRequestMetrics;
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionData;
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionInput;
+import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionsInput;
 import com.googlesource.gerrit.plugins.replication.pull.filter.SyncRefsFilter;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.util.List;
 import java.util.Optional;
 import org.apache.http.HttpResponse;
 import org.apache.http.ParseException;
@@ -100,7 +104,8 @@
    * @see com.googlesource.gerrit.plugins.replication.pull.client.FetchApiClient#callFetch(com.google.gerrit.entities.Project.NameKey, java.lang.String, org.eclipse.jgit.transport.URIish)
    */
   @Override
-  public HttpResult callFetch(Project.NameKey project, String refName, URIish targetUri)
+  public HttpResult callFetch(
+      Project.NameKey project, String refName, URIish targetUri, long startTimeNanos)
       throws ClientProtocolException, IOException {
     String url =
         String.format(
@@ -115,6 +120,9 @@
                 instanceId, refName, callAsync),
             StandardCharsets.UTF_8));
     post.addHeader(new BasicHeader("Content-Type", "application/json"));
+    post.addHeader(
+        PullReplicationApiRequestMetrics.HTTP_HEADER_X_START_TIME_NANOS,
+        Long.toString(startTimeNanos));
     return httpClientFactory.create(source).execute(post, this, getContext(targetUri));
   }
 
@@ -179,10 +187,7 @@
     }
     RevisionInput input = new RevisionInput(instanceId, refName, revisionData);
 
-    String url =
-        String.format(
-            "%s/a/projects/%s/%s~apply-object",
-            targetUri.toString(), Url.encode(project.get()), pluginName);
+    String url = formatUrl(project, targetUri, "apply-object");
 
     HttpPost post = new HttpPost(url);
     post.setEntity(new StringEntity(GSON.toJson(input)));
@@ -190,6 +195,32 @@
     return httpClientFactory.create(source).execute(post, this, getContext(targetUri));
   }
 
+  @Override
+  public HttpResult callSendObjects(
+      NameKey project, String refName, List<RevisionData> revisionData, URIish targetUri)
+      throws ClientProtocolException, IOException {
+    if (revisionData.size() == 1) {
+      return callSendObject(project, refName, false, revisionData.get(0), targetUri);
+    }
+
+    RevisionData[] inputData = new RevisionData[revisionData.size()];
+    RevisionsInput input = new RevisionsInput(instanceId, refName, revisionData.toArray(inputData));
+
+    String url = formatUrl(project, targetUri, "apply-objects");
+    HttpPost post = new HttpPost(url);
+    post.setEntity(new StringEntity(GSON.toJson(input)));
+    post.addHeader(new BasicHeader("Content-Type", MediaType.JSON_UTF_8.toString()));
+    return httpClientFactory.create(source).execute(post, this, getContext(targetUri));
+  }
+
+  private String formatUrl(Project.NameKey project, URIish targetUri, String api) {
+    String url =
+        String.format(
+            "%s/a/projects/%s/%s~%s",
+            targetUri.toString(), Url.encode(project.get()), pluginName, api);
+    return url;
+  }
+
   private void requireNull(Object object, String string) {
     if (object != null) {
       throw new IllegalArgumentException(string);
@@ -198,13 +229,20 @@
 
   @Override
   public HttpResult handleResponse(HttpResponse response) {
-    Optional<String> responseBody = Optional.empty();
 
-    try {
-      responseBody = Optional.ofNullable(EntityUtils.toString(response.getEntity()));
-    } catch (ParseException | IOException e) {
-      logger.atSevere().withCause(e).log("Unable get response body from %s", response.toString());
-    }
+    Optional<String> responseBody =
+        Optional.ofNullable(response.getEntity())
+            .flatMap(
+                body -> {
+                  try {
+                    return Optional.of(EntityUtils.toString(body));
+                  } catch (ParseException | IOException e) {
+                    logger.atSevere().withCause(e).log(
+                        "Unable get response body from %s", response.toString());
+                    return Optional.empty();
+                  }
+                });
+
     return new HttpResult(response.getStatusLine().getStatusCode(), responseBody);
   }
 
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResult.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResult.java
index bd164df..ec9d65f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResult.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResult.java
@@ -15,9 +15,6 @@
 package com.googlesource.gerrit.plugins.replication.pull.client;
 
 import static javax.servlet.http.HttpServletResponse.SC_CONFLICT;
-import static javax.servlet.http.HttpServletResponse.SC_CREATED;
-import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT;
-import static javax.servlet.http.HttpServletResponse.SC_OK;
 
 import com.google.gerrit.entities.Project;
 import java.util.Optional;
@@ -36,7 +33,7 @@
   }
 
   public boolean isSuccessful() {
-    return responseCode == SC_CREATED || responseCode == SC_NO_CONTENT || responseCode == SC_OK;
+    return responseCode / 100 == 2; // Any 2xx response code is a success
   }
 
   public boolean isProjectMissing(Project.NameKey projectName) {
@@ -47,4 +44,11 @@
   public boolean isParentObjectMissing() {
     return responseCode == SC_CONFLICT;
   }
+
+  @Override
+  public String toString() {
+    return isSuccessful()
+        ? "OK"
+        : "FAILED" + ", status=" + responseCode + message.map(s -> " '" + s + "'").orElse("");
+  }
 }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListener.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListener.java
index 76e3cae..0f092e5 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListener.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListener.java
@@ -30,11 +30,13 @@
 import com.google.gerrit.server.git.WorkQueue;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.inject.Inject;
+import com.google.inject.Provider;
 import com.googlesource.gerrit.plugins.replication.pull.FetchOne;
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchAction;
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchJob;
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchJob.Factory;
 import com.googlesource.gerrit.plugins.replication.pull.api.ProjectInitializationAction;
+import com.googlesource.gerrit.plugins.replication.pull.api.PullReplicationApiRequestMetrics;
 import org.eclipse.jgit.lib.ObjectId;
 
 public class StreamEventListener implements EventListener {
@@ -45,17 +47,20 @@
   private ProjectInitializationAction projectInitializationAction;
 
   private Factory fetchJobFactory;
+  private final Provider<PullReplicationApiRequestMetrics> metricsProvider;
 
   @Inject
   public StreamEventListener(
       @Nullable @GerritInstanceId String instanceId,
       ProjectInitializationAction projectInitializationAction,
       WorkQueue workQueue,
-      FetchJob.Factory fetchJobFactory) {
+      FetchJob.Factory fetchJobFactory,
+      Provider<PullReplicationApiRequestMetrics> metricsProvider) {
     this.instanceId = instanceId;
     this.projectInitializationAction = projectInitializationAction;
     this.workQueue = workQueue;
     this.fetchJobFactory = fetchJobFactory;
+    this.metricsProvider = metricsProvider;
 
     requireNonNull(
         Strings.emptyToNull(this.instanceId), "gerrit.instanceId cannot be null or empty");
@@ -64,13 +69,16 @@
   @Override
   public void onEvent(Event event) {
     if (!instanceId.equals(event.instanceId)) {
+      PullReplicationApiRequestMetrics metrics = metricsProvider.get();
+      metrics.start(event);
       if (event instanceof RefUpdatedEvent) {
         RefUpdatedEvent refUpdatedEvent = (RefUpdatedEvent) event;
         if (!isProjectDelete(refUpdatedEvent)) {
           fetchRefsAsync(
               refUpdatedEvent.getRefName(),
               refUpdatedEvent.instanceId,
-              refUpdatedEvent.getProjectNameKey());
+              refUpdatedEvent.getProjectNameKey(),
+              metrics);
         }
       }
       if (event instanceof ProjectCreatedEvent) {
@@ -80,7 +88,8 @@
           fetchRefsAsync(
               FetchOne.ALL_REFS,
               projectCreatedEvent.instanceId,
-              projectCreatedEvent.getProjectNameKey());
+              projectCreatedEvent.getProjectNameKey(),
+              metrics);
         } catch (AuthException | PermissionBackendException e) {
           logger.atSevere().withCause(e).log(
               "Cannot initialise project:%s", projectCreatedEvent.projectName);
@@ -94,11 +103,15 @@
         && ObjectId.zeroId().equals(ObjectId.fromString(event.refUpdate.get().newRev));
   }
 
-  protected void fetchRefsAsync(String refName, String sourceInstanceId, NameKey projectNameKey) {
+  protected void fetchRefsAsync(
+      String refName,
+      String sourceInstanceId,
+      NameKey projectNameKey,
+      PullReplicationApiRequestMetrics metrics) {
     FetchAction.Input input = new FetchAction.Input();
     input.refName = refName;
     input.label = sourceInstanceId;
-    workQueue.getDefaultQueue().submit(fetchJobFactory.create(projectNameKey, input));
+    workQueue.getDefaultQueue().submit(fetchJobFactory.create(projectNameKey, input, metrics));
   }
 
   private String getProjectRepositoryName(ProjectCreatedEvent projectCreatedEvent) {
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObject.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObject.java
index 03362bf..2bb1caf 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObject.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObject.java
@@ -41,35 +41,51 @@
     this.gitManager = gitManager;
   }
 
-  public RefUpdateState apply(Project.NameKey name, RefSpec refSpec, RevisionData revisionData)
+  public RefUpdateState apply(Project.NameKey name, RefSpec refSpec, RevisionData[] revisionsData)
       throws MissingParentObjectException, IOException {
     try (Repository git = gitManager.openRepository(name)) {
 
-      ObjectId newObjectID = null;
+      ObjectId refHead = null;
+      RefUpdate ru = git.updateRef(refSpec.getSource());
       try (ObjectInserter oi = git.newObjectInserter()) {
-        RevisionObjectData commitObject = revisionData.getCommitObject();
-        RevCommit commit = RevCommit.parse(commitObject.getContent());
-        for (RevCommit parent : commit.getParents()) {
-          if (!git.getObjectDatabase().has(parent.getId())) {
-            throw new MissingParentObjectException(name, refSpec.getSource(), parent.getId());
+        for (RevisionData revisionData : revisionsData) {
+
+          ObjectId newObjectID = null;
+          RevisionObjectData commitObject = revisionData.getCommitObject();
+
+          if (commitObject != null) {
+            RevCommit commit = RevCommit.parse(commitObject.getContent());
+            for (RevCommit parent : commit.getParents()) {
+              if (!git.getObjectDatabase().has(parent.getId())) {
+                throw new MissingParentObjectException(name, refSpec.getSource(), parent.getId());
+              }
+            }
+            refHead = newObjectID = oi.insert(commitObject.getType(), commitObject.getContent());
+
+            RevisionObjectData treeObject = revisionData.getTreeObject();
+            oi.insert(treeObject.getType(), treeObject.getContent());
+          }
+
+          for (RevisionObjectData rev : revisionData.getBlobs()) {
+            ObjectId blobObjectId = oi.insert(rev.getType(), rev.getContent());
+            if (newObjectID == null) {
+              newObjectID = blobObjectId;
+            }
+            refHead = newObjectID;
+          }
+
+          oi.flush();
+
+          if (commitObject == null) {
+            // Non-commits must be forced as they do not have a graph associated
+            ru.setForceUpdate(true);
           }
         }
-        newObjectID = oi.insert(commitObject.getType(), commitObject.getContent());
 
-        RevisionObjectData treeObject = revisionData.getTreeObject();
-        oi.insert(treeObject.getType(), treeObject.getContent());
-
-        for (RevisionObjectData rev : revisionData.getBlobs()) {
-          oi.insert(rev.getType(), rev.getContent());
-        }
-
-        oi.flush();
+        ru.setNewObjectId(refHead);
+        RefUpdate.Result result = ru.update();
+        return new RefUpdateState(refSpec.getSource(), result);
       }
-      RefUpdate ru = git.updateRef(refSpec.getSource());
-      ru.setNewObjectId(newObjectID);
-      RefUpdate.Result result = ru.update();
-
-      return new RefUpdateState(refSpec.getSource(), result);
     }
   }
 }
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationAsyncIT.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationAsyncIT.java
new file mode 100644
index 0000000..58be58e
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationAsyncIT.java
@@ -0,0 +1,43 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull;
+
+import com.google.gerrit.acceptance.SkipProjectClone;
+import com.google.gerrit.acceptance.TestPlugin;
+import com.google.gerrit.acceptance.UseLocalDisk;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.inject.Inject;
+import org.eclipse.jgit.storage.file.FileBasedConfig;
+import org.eclipse.jgit.util.FS;
+
+@SkipProjectClone
+@UseLocalDisk
+@TestPlugin(
+    name = "pull-replication",
+    sysModule = "com.googlesource.gerrit.plugins.replication.pull.PullReplicationModule",
+    httpModule = "com.googlesource.gerrit.plugins.replication.pull.api.HttpModule")
+public class PullReplicationAsyncIT extends PullReplicationIT {
+  @Inject private SitePaths sitePaths;
+
+  @Override
+  public void setUpTestPlugin() throws Exception {
+    FileBasedConfig config =
+        new FileBasedConfig(sitePaths.etc_dir.resolve("replication.config").toFile(), FS.DETECTED);
+    config.setString("replication", null, "syncRefs", "^$");
+    config.save();
+
+    super.setUpTestPlugin(true);
+  }
+}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationIT.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationIT.java
index 13b3460..62f42c3 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/PullReplicationIT.java
@@ -51,6 +51,7 @@
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
 import com.googlesource.gerrit.plugins.replication.AutoReloadConfigDecorator;
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Path;
 import java.time.Duration;
@@ -79,11 +80,12 @@
 @UseLocalDisk
 @TestPlugin(
     name = "pull-replication",
-    sysModule = "com.googlesource.gerrit.plugins.replication.pull.PullReplicationModule")
+    sysModule = "com.googlesource.gerrit.plugins.replication.pull.PullReplicationModule",
+    httpModule = "com.googlesource.gerrit.plugins.replication.pull.api.HttpModule")
 public class PullReplicationIT extends LightweightPluginDaemonTest {
   private static final Optional<String> ALL_PROJECTS = Optional.empty();
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
-  private static final int TEST_REPLICATION_DELAY = 60;
+  private static final int TEST_REPLICATION_DELAY = 1;
   private static final Duration TEST_TIMEOUT = Duration.ofSeconds(TEST_REPLICATION_DELAY * 2000);
   private static final String TEST_REPLICATION_SUFFIX = "suffix1";
   private static final String TEST_REPLICATION_REMOTE = "remote1";
@@ -97,10 +99,17 @@
 
   @Override
   public void setUpTestPlugin() throws Exception {
+    setUpTestPlugin(false);
+  }
+
+  protected void setUpTestPlugin(boolean loadExisting) throws Exception {
     gitPath = sitePaths.site_path.resolve("git");
 
-    config =
-        new FileBasedConfig(sitePaths.etc_dir.resolve("replication.config").toFile(), FS.DETECTED);
+    File configFile = sitePaths.etc_dir.resolve("replication.config").toFile();
+    config = new FileBasedConfig(configFile, FS.DETECTED);
+    if (loadExisting && configFile.exists()) {
+      config.load();
+    }
     setReplicationSource(
         TEST_REPLICATION_REMOTE,
         TEST_REPLICATION_SUFFIX,
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueueTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueueTest.java
index 4e831bc..48e0e71 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueueTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/ReplicationQueueTest.java
@@ -17,9 +17,12 @@
 import static com.google.common.truth.Truth.assertThat;
 import static java.nio.file.Files.createTempDirectory;
 import static org.mockito.ArgumentMatchers.anyBoolean;
-import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.anyInt;
+import static org.mockito.Mockito.anyLong;
 import static org.mockito.Mockito.anyString;
+import static org.mockito.Mockito.eq;
+import static org.mockito.Mockito.lenient;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
@@ -35,6 +38,7 @@
 import com.google.gerrit.extensions.events.GitReferenceUpdatedListener.Event;
 import com.google.gerrit.extensions.events.ProjectDeletedListener;
 import com.google.gerrit.extensions.registration.DynamicItem;
+import com.google.gerrit.metrics.DisabledMetricMaker;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.events.EventDispatcher;
 import com.google.gerrit.server.git.WorkQueue;
@@ -49,6 +53,8 @@
 import com.googlesource.gerrit.plugins.replication.pull.filter.ExcludedRefsFilter;
 import java.io.IOException;
 import java.nio.file.Path;
+import java.util.Arrays;
+import java.util.List;
 import java.util.Optional;
 import org.apache.http.client.ClientProtocolException;
 import org.eclipse.jgit.errors.LargeObjectException;
@@ -78,10 +84,17 @@
   @Mock AccountInfo accountInfo;
   @Mock RevisionReader revReader;
   @Mock RevisionData revisionData;
+  @Mock HttpResult successfulHttpResult;
+  @Mock HttpResult fetchHttpResult;
+  @Mock RevisionData revisionDataWithParents;
+  List<ObjectId> revisionDataParentObjectIds;
   @Mock HttpResult httpResult;
+  ApplyObjectMetrics applyObjectMetrics;
+  FetchReplicationMetrics fetchMetrics;
 
   @Captor ArgumentCaptor<String> stringCaptor;
   @Captor ArgumentCaptor<Project.NameKey> projectNameKeyCaptor;
+  @Captor ArgumentCaptor<List<RevisionData>> revisionsDataCaptor;
 
   private ExcludedRefsFilter refsFilter;
   private ReplicationQueue objectUnderTest;
@@ -102,16 +115,51 @@
     when(source.getApis()).thenReturn(apis);
     when(sourceCollection.getAll()).thenReturn(Lists.newArrayList(source));
     when(rd.get()).thenReturn(sourceCollection);
-    when(revReader.read(any(), any(), anyString())).thenReturn(Optional.of(revisionData));
+    lenient()
+        .when(revReader.read(any(), any(), anyString(), eq(0)))
+        .thenReturn(Optional.of(revisionData));
+    lenient().when(revReader.read(any(), anyString(), eq(0))).thenReturn(Optional.of(revisionData));
+    lenient()
+        .when(revReader.read(any(), any(), anyString(), eq(Integer.MAX_VALUE)))
+        .thenReturn(Optional.of(revisionDataWithParents));
+    lenient()
+        .when(revReader.read(any(), anyString(), eq(Integer.MAX_VALUE)))
+        .thenReturn(Optional.of(revisionDataWithParents));
+    revisionDataParentObjectIds =
+        Arrays.asList(
+            ObjectId.fromString("9f8d52853089a3cf00c02ff7bd0817bd4353a95a"),
+            ObjectId.fromString("b5d7bcf1d1c5b0f0726d10a16c8315f06f900bfb"));
+    when(revisionDataWithParents.getParentObjetIds()).thenReturn(revisionDataParentObjectIds);
+
     when(fetchClientFactory.create(any())).thenReturn(fetchRestApiClient);
-    when(fetchRestApiClient.callSendObject(any(), anyString(), anyBoolean(), any(), any()))
+    lenient()
+        .when(fetchRestApiClient.callSendObject(any(), anyString(), anyBoolean(), any(), any()))
         .thenReturn(httpResult);
-    when(fetchRestApiClient.callFetch(any(), anyString(), any())).thenReturn(httpResult);
+    lenient()
+        .when(fetchRestApiClient.callSendObjects(any(), anyString(), any(), any()))
+        .thenReturn(httpResult);
+    when(fetchRestApiClient.callFetch(any(), anyString(), any(), anyLong()))
+        .thenReturn(fetchHttpResult);
+    when(fetchRestApiClient.initProject(any(), any())).thenReturn(successfulHttpResult);
+    when(successfulHttpResult.isSuccessful()).thenReturn(true);
     when(httpResult.isSuccessful()).thenReturn(true);
+    when(fetchHttpResult.isSuccessful()).thenReturn(true);
     when(httpResult.isProjectMissing(any())).thenReturn(false);
 
+    applyObjectMetrics = new ApplyObjectMetrics("pull-replication", new DisabledMetricMaker());
+    fetchMetrics = new FetchReplicationMetrics("pull-replication", new DisabledMetricMaker());
+
     objectUnderTest =
-        new ReplicationQueue(wq, rd, dis, sl, fetchClientFactory, refsFilter, revReader);
+        new ReplicationQueue(
+            wq,
+            rd,
+            dis,
+            sl,
+            fetchClientFactory,
+            refsFilter,
+            () -> revReader,
+            applyObjectMetrics,
+            fetchMetrics);
   }
 
   @Test
@@ -120,7 +168,7 @@
     objectUnderTest.start();
     objectUnderTest.onGitReferenceUpdated(event);
 
-    verify(fetchRestApiClient).callSendObject(any(), anyString(), eq(false), any(), any());
+    verify(fetchRestApiClient).callSendObjects(any(), anyString(), any(), any());
   }
 
   @Test
@@ -155,7 +203,7 @@
     objectUnderTest.start();
     objectUnderTest.onGitReferenceUpdated(event);
 
-    verify(fetchRestApiClient).callSendObject(any(), anyString(), eq(false), any(), any());
+    verify(fetchRestApiClient).callSendObjects(any(), anyString(), any(), any());
   }
 
   @Test
@@ -164,11 +212,11 @@
     Event event = new TestEvent("refs/changes/01/1/meta");
     objectUnderTest.start();
 
-    when(revReader.read(any(), any(), anyString())).thenThrow(IOException.class);
+    when(revReader.read(any(), any(), anyString(), anyInt())).thenThrow(IOException.class);
 
     objectUnderTest.onGitReferenceUpdated(event);
 
-    verify(fetchRestApiClient).callFetch(any(), anyString(), any());
+    verify(fetchRestApiClient).callFetch(any(), anyString(), any(), anyLong());
   }
 
   @Test
@@ -177,27 +225,53 @@
     Event event = new TestEvent("refs/changes/01/1/1");
     objectUnderTest.start();
 
-    when(revReader.read(any(), any(), anyString())).thenReturn(Optional.empty());
+    when(revReader.read(any(), any(), anyString(), anyInt())).thenReturn(Optional.empty());
 
     objectUnderTest.onGitReferenceUpdated(event);
 
-    verify(fetchRestApiClient).callFetch(any(), anyString(), any());
+    verify(fetchRestApiClient).callFetch(any(), anyString(), any(), anyLong());
   }
 
   @Test
   public void shouldFallbackToCallFetchWhenParentObjectIsMissing()
       throws ClientProtocolException, IOException {
-    Event event = new TestEvent("refs/changes/01/1/meta");
+    Event event = new TestEvent("refs/changes/01/1/1");
     objectUnderTest.start();
 
     when(httpResult.isSuccessful()).thenReturn(false);
     when(httpResult.isParentObjectMissing()).thenReturn(true);
-    when(fetchRestApiClient.callSendObject(any(), anyString(), eq(false), any(), any()))
+    when(fetchRestApiClient.callSendObjects(any(), anyString(), any(), any()))
         .thenReturn(httpResult);
 
     objectUnderTest.onGitReferenceUpdated(event);
 
-    verify(fetchRestApiClient).callFetch(any(), anyString(), any());
+    verify(fetchRestApiClient).callFetch(any(), anyString(), any(), anyLong());
+  }
+
+  @Test
+  public void shouldFallbackToApplyAllParentObjectsWhenParentObjectIsMissingOnMetaRef()
+      throws ClientProtocolException, IOException {
+    Event event = new TestEvent("refs/changes/01/1/meta");
+    objectUnderTest.start();
+
+    when(httpResult.isSuccessful()).thenReturn(false, true);
+    when(httpResult.isParentObjectMissing()).thenReturn(true, false);
+    when(fetchRestApiClient.callSendObjects(any(), anyString(), any(), any()))
+        .thenReturn(httpResult);
+
+    objectUnderTest.onGitReferenceUpdated(event);
+
+    verify(fetchRestApiClient, times(2))
+        .callSendObjects(any(), anyString(), revisionsDataCaptor.capture(), any());
+    List<List<RevisionData>> revisionsDataValues = revisionsDataCaptor.getAllValues();
+    assertThat(revisionsDataValues).hasSize(2);
+
+    List<RevisionData> firstRevisionsValues = revisionsDataValues.get(0);
+    assertThat(firstRevisionsValues).hasSize(1);
+    assertThat(firstRevisionsValues).contains(revisionData);
+
+    List<RevisionData> secondRevisionsValues = revisionsDataValues.get(1);
+    assertThat(secondRevisionsValues).hasSize(1 + revisionDataParentObjectIds.size());
   }
 
   @Test
@@ -242,7 +316,16 @@
     refsFilter = new ExcludedRefsFilter(replicationConfig);
 
     objectUnderTest =
-        new ReplicationQueue(wq, rd, dis, sl, fetchClientFactory, refsFilter, revReader);
+        new ReplicationQueue(
+            wq,
+            rd,
+            dis,
+            sl,
+            fetchClientFactory,
+            refsFilter,
+            () -> revReader,
+            applyObjectMetrics,
+            fetchMetrics);
     Event event = new TestEvent("refs/multi-site/version");
     objectUnderTest.onGitReferenceUpdated(event);
 
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReaderIT.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReaderIT.java
index e300613..1d8520f 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReaderIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/RevisionReaderIT.java
@@ -24,12 +24,14 @@
 import com.google.gerrit.acceptance.TestPlugin;
 import com.google.gerrit.acceptance.UseLocalDisk;
 import com.google.gerrit.entities.Change;
+import com.google.gerrit.entities.Change.Id;
 import com.google.gerrit.entities.Patch;
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.api.changes.ReviewInput;
 import com.google.gerrit.extensions.api.changes.ReviewInput.CommentInput;
 import com.google.gerrit.extensions.client.Comment;
 import com.google.gerrit.extensions.config.FactoryModule;
+import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.server.notedb.Sequences;
 import com.google.inject.Scopes;
 import com.googlesource.gerrit.plugins.replication.ReplicationConfig;
@@ -38,11 +40,13 @@
 import com.googlesource.gerrit.plugins.replication.pull.api.data.RevisionObjectData;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.ApplyObject;
 import java.io.IOException;
+import java.util.List;
 import java.util.Optional;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.storage.file.FileBasedConfig;
 import org.junit.Before;
 import org.junit.Test;
 
@@ -53,9 +57,12 @@
 public class RevisionReaderIT extends LightweightPluginDaemonTest {
   RevisionReader objectUnderTest;
 
+  ReplicationFileBasedConfig replicationConfig;
+
   @Before
   public void setup() {
     objectUnderTest = plugin.getSysInjector().getInstance(RevisionReader.class);
+    replicationConfig = plugin.getSysInjector().getInstance(ReplicationFileBasedConfig.class);
   }
 
   @Test
@@ -64,7 +71,7 @@
     String refName = RefNames.changeMetaRef(pushResult.getChange().getId());
 
     Optional<RevisionData> revisionDataOption =
-        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId));
+        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId, 0));
 
     assertThat(revisionDataOption.isPresent()).isTrue();
     RevisionData revisionData = revisionDataOption.get();
@@ -80,9 +87,65 @@
     assertThat(revisionData.getBlobs()).isEmpty();
   }
 
-  private Optional<RevisionData> readRevisionFromObjectUnderTest(String refName, ObjectId objId) {
+  @Test
+  public void shouldReadRefMetaObjectWithMaxNumberOfParents() throws Exception {
+    int numberOfParents = 3;
+    setReplicationConfig(numberOfParents);
+    Result pushResult = createChange();
+    Id changeId = pushResult.getChange().getId();
+    String refName = RefNames.changeMetaRef(pushResult.getChange().getId());
+
+    addMultipleComments(numberOfParents, changeId);
+
+    Optional<RevisionData> revisionDataOption =
+        refObjectId(refName)
+            .flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId, numberOfParents));
+
+    assertThat(revisionDataOption.isPresent()).isTrue();
+    List<ObjectId> parentObjectIds = revisionDataOption.get().getParentObjetIds();
+    assertThat(parentObjectIds).hasSize(numberOfParents);
+  }
+
+  @Test
+  public void shouldReadRefMetaObjectLimitedToMaxNumberOfParents() throws Exception {
+    int numberOfParents = 3;
+    setReplicationConfig(numberOfParents);
+    Result pushResult = createChange();
+    Id changeId = pushResult.getChange().getId();
+    String refName = RefNames.changeMetaRef(pushResult.getChange().getId());
+
+    addMultipleComments(numberOfParents + 1, changeId);
+
+    Optional<RevisionData> revisionDataOption =
+        refObjectId(refName)
+            .flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId, numberOfParents));
+
+    assertThat(revisionDataOption.isPresent()).isTrue();
+    List<ObjectId> parentObjectIds = revisionDataOption.get().getParentObjetIds();
+    assertThat(parentObjectIds).hasSize(numberOfParents);
+  }
+
+  private void addMultipleComments(int numberOfParents, Id changeId) throws RestApiException {
+    for (int i = 0; i < numberOfParents; i++) {
+      addComment(changeId);
+    }
+  }
+
+  private void setReplicationConfig(int numberOfParents) throws IOException {
+    FileBasedConfig config = (FileBasedConfig) replicationConfig.getConfig();
+    config.setInt(
+        "replication", null, RevisionReader.CONFIG_MAX_API_HISTORY_DEPTH, numberOfParents);
+    config.save();
+  }
+
+  private void addComment(Id changeId) throws RestApiException {
+    gApi.changes().id(changeId.get()).current().review(new ReviewInput().message("foo"));
+  }
+
+  private Optional<RevisionData> readRevisionFromObjectUnderTest(
+      String refName, ObjectId objId, int maxParentsDepth) {
     try {
-      return objectUnderTest.read(project, objId, refName);
+      return objectUnderTest.read(project, objId, refName, maxParentsDepth);
     } catch (Exception e) {
       throw new IllegalStateException(e);
     }
@@ -107,7 +170,7 @@
     gApi.changes().id(changeId.get()).current().review(reviewInput);
 
     Optional<RevisionData> revisionDataOption =
-        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId));
+        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId, 0));
 
     assertThat(revisionDataOption.isPresent()).isTrue();
     RevisionData revisionData = revisionDataOption.get();
@@ -131,7 +194,7 @@
     createChange().assertOkStatus();
     String refName = RefNames.REFS_SEQUENCES + Sequences.NAME_CHANGES;
     Optional<RevisionData> revisionDataOption =
-        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId));
+        refObjectId(refName).flatMap(objId -> readRevisionFromObjectUnderTest(refName, objId, 0));
 
     Truth8.assertThat(revisionDataOption).isEmpty();
   }
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
index e6f788a..7cef485 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ActionITBase.java
@@ -149,7 +149,8 @@
   protected Optional<RevisionData> createRevisionData(NameKey projectName, String refName)
       throws Exception {
     try (Repository repository = repoManager.openRepository(projectName)) {
-      return revisionReader.read(projectName, repository.exactRef(refName).getObjectId(), refName);
+      return revisionReader.read(
+          projectName, repository.exactRef(refName).getObjectId(), refName, 0);
     }
   }
 
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectActionTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectActionTest.java
index 56e1429..814ba76 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectActionTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectActionTest.java
@@ -35,6 +35,9 @@
 import com.googlesource.gerrit.plugins.replication.pull.api.exception.MissingParentObjectException;
 import com.googlesource.gerrit.plugins.replication.pull.api.exception.RefUpdateException;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Collections;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.ObjectId;
 import org.junit.Before;
@@ -49,11 +52,18 @@
   String label = "instance-2-label";
   String url = "file:///gerrit-host/instance-1/git/${name}.git";
   String refName = "refs/heads/master";
+  String refMetaName = "refs/meta/version";
   String location = "http://gerrit-host/a/config/server/tasks/08d173e9";
   int taskId = 1234;
 
+  private String sampleCommitObjectId = "9f8d52853089a3cf00c02ff7bd0817bd4353a95a";
+  private String sampleTreeObjectId = "4b825dc642cb6eb9a060e54bf8d69288fbee4904";
+  private String sampleBlobObjectId = "b5d7bcf1d1c5b0f0726d10a16c8315f06f900bfb";
+
   private String sampleCommitContent =
-      "tree 4b825dc642cb6eb9a060e54bf8d69288fbee4904\n"
+      "tree "
+          + sampleTreeObjectId
+          + "\n"
           + "parent 20eb48d28be86dc88fb4bef747f08de0fbefe12d\n"
           + "author Gerrit User 1000000 <1000000@69ec38f0-350e-4d9c-96d4-bc956f2faaac> 1610471611 +0100\n"
           + "committer Gerrit Code Review <root@maczech-XPS-15> 1610471611 +0100\n"
@@ -92,6 +102,21 @@
     assertThat(response.statusCode()).isEqualTo(SC_CREATED);
   }
 
+  @Test
+  public void shouldReturnCreatedResponseCodeForBlob() throws RestApiException {
+    byte[] blobData = "foo".getBytes(StandardCharsets.UTF_8);
+    RevisionInput inputParams =
+        new RevisionInput(
+            label,
+            refMetaName,
+            createSampleRevisionDataBlob(
+                new RevisionObjectData(sampleBlobObjectId, Constants.OBJ_BLOB, blobData)));
+
+    Response<?> response = applyObjectAction.apply(projectResource, inputParams);
+
+    assertThat(response.statusCode()).isEqualTo(SC_CREATED);
+  }
+
   @SuppressWarnings("cast")
   @Test
   public void shouldReturnSourceUrlAndrefNameAsAResponseBody() throws Exception {
@@ -131,8 +156,10 @@
 
   @Test(expected = BadRequestException.class)
   public void shouldThrowBadRequestExceptionWhenMissingCommitObjectData() throws Exception {
-    RevisionObjectData commitData = new RevisionObjectData(Constants.OBJ_COMMIT, null);
-    RevisionObjectData treeData = new RevisionObjectData(Constants.OBJ_TREE, new byte[] {});
+    RevisionObjectData commitData =
+        new RevisionObjectData(sampleCommitObjectId, Constants.OBJ_COMMIT, null);
+    RevisionObjectData treeData =
+        new RevisionObjectData(sampleTreeObjectId, Constants.OBJ_TREE, new byte[] {});
     RevisionInput inputParams =
         new RevisionInput(label, refName, createSampleRevisionData(commitData, treeData));
 
@@ -142,7 +169,8 @@
   @Test(expected = BadRequestException.class)
   public void shouldThrowBadRequestExceptionWhenMissingTreeObject() throws Exception {
     RevisionObjectData commitData =
-        new RevisionObjectData(Constants.OBJ_COMMIT, sampleCommitContent.getBytes());
+        new RevisionObjectData(
+            sampleCommitObjectId, Constants.OBJ_COMMIT, sampleCommitContent.getBytes());
     RevisionInput inputParams =
         new RevisionInput(label, refName, createSampleRevisionData(commitData, null));
 
@@ -175,13 +203,19 @@
 
   private RevisionData createSampleRevisionData() {
     RevisionObjectData commitData =
-        new RevisionObjectData(Constants.OBJ_COMMIT, sampleCommitContent.getBytes());
-    RevisionObjectData treeData = new RevisionObjectData(Constants.OBJ_TREE, new byte[] {});
+        new RevisionObjectData(
+            sampleCommitObjectId, Constants.OBJ_COMMIT, sampleCommitContent.getBytes());
+    RevisionObjectData treeData =
+        new RevisionObjectData(sampleTreeObjectId, Constants.OBJ_TREE, new byte[] {});
     return createSampleRevisionData(commitData, treeData);
   }
 
   private RevisionData createSampleRevisionData(
       RevisionObjectData commitData, RevisionObjectData treeData) {
-    return new RevisionData(commitData, treeData, Lists.newArrayList());
+    return new RevisionData(Collections.emptyList(), commitData, treeData, Lists.newArrayList());
+  }
+
+  private RevisionData createSampleRevisionDataBlob(RevisionObjectData blob) {
+    return new RevisionData(Collections.emptyList(), null, null, Arrays.asList(blob));
   }
 }
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommandTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommandTest.java
index 51051c0..d73a6e7 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommandTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/ApplyObjectCommandTest.java
@@ -38,6 +38,7 @@
 import com.googlesource.gerrit.plugins.replication.pull.fetch.ApplyObject;
 import com.googlesource.gerrit.plugins.replication.pull.fetch.RefUpdateState;
 import java.io.IOException;
+import java.util.Collections;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.RefUpdate;
 import org.junit.Before;
@@ -55,6 +56,10 @@
   private static final NameKey TEST_PROJECT_NAME = Project.nameKey("test-project");
   private static final String TEST_REMOTE_NAME = "test-remote-name";
 
+  private String sampleCommitObjectId = "9f8d52853089a3cf00c02ff7bd0817bd4353a95a";
+  private String sampleTreeObjectId = "4b825dc642cb6eb9a060e54bf8d69288fbee4904";
+  private String sampleBlobObjectId = "b5d7bcf1d1c5b0f0726d10a16c8315f06f900bfb";
+
   @Mock private PullReplicationStateLogger fetchStateLog;
   @Mock private ApplyObject applyObject;
   @Mock private ApplyObjectMetrics metrics;
@@ -93,8 +98,10 @@
   }
 
   private RevisionData createSampleRevisionData() {
-    RevisionObjectData commitData = new RevisionObjectData(Constants.OBJ_COMMIT, new byte[] {});
-    RevisionObjectData treeData = new RevisionObjectData(Constants.OBJ_TREE, new byte[] {});
-    return new RevisionData(commitData, treeData, Lists.newArrayList());
+    RevisionObjectData commitData =
+        new RevisionObjectData(sampleCommitObjectId, Constants.OBJ_COMMIT, new byte[] {});
+    RevisionObjectData treeData =
+        new RevisionObjectData(sampleTreeObjectId, Constants.OBJ_TREE, new byte[] {});
+    return new RevisionData(Collections.emptyList(), commitData, treeData, Lists.newArrayList());
   }
 }
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
index daf2001..4415a4b 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/DeleteRefCommandTest.java
@@ -16,6 +16,7 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static org.mockito.Mockito.any;
+import static org.mockito.Mockito.anyString;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
@@ -24,12 +25,22 @@
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.server.events.Event;
 import com.google.gerrit.server.events.EventDispatcher;
+import com.google.gerrit.server.git.LocalDiskRepositoryManager;
+import com.google.gerrit.server.permissions.PermissionBackend;
+import com.google.gerrit.server.permissions.PermissionBackend.ForProject;
+import com.google.gerrit.server.permissions.PermissionBackend.ForRef;
+import com.google.gerrit.server.permissions.PermissionBackend.WithUser;
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.gerrit.server.project.ProjectState;
-import com.google.gerrit.server.restapi.project.DeleteRef;
 import com.googlesource.gerrit.plugins.replication.pull.FetchRefReplicatedEvent;
 import com.googlesource.gerrit.plugins.replication.pull.PullReplicationStateLogger;
+import com.googlesource.gerrit.plugins.replication.pull.fetch.ApplyObject;
 import java.util.Optional;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.RefDatabase;
+import org.eclipse.jgit.lib.RefUpdate;
+import org.eclipse.jgit.lib.RefUpdate.Result;
+import org.eclipse.jgit.lib.Repository;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -48,19 +59,42 @@
   @Mock private DynamicItem<EventDispatcher> eventDispatcherDataItem;
   @Mock private EventDispatcher eventDispatcher;
   @Mock private ProjectCache projectCache;
-  @Mock private DeleteRef deleteRef;
+  @Mock private ApplyObject applyObject;
   @Mock private ProjectState projectState;
+  @Mock private PermissionBackend permissionBackend;
+  @Mock private WithUser currentUser;
+  @Mock private ForProject forProject;
+  @Mock private ForRef forRef;
+  @Mock private LocalDiskRepositoryManager gitManager;
+  @Mock private RefUpdate refUpdate;
+  @Mock private Repository repository;
+  @Mock private Ref currentRef;
+  @Mock private RefDatabase refDb;
   @Captor ArgumentCaptor<Event> eventCaptor;
 
   private DeleteRefCommand objectUnderTest;
 
   @Before
-  public void setup() {
+  public void setup() throws Exception {
     when(eventDispatcherDataItem.get()).thenReturn(eventDispatcher);
     when(projectCache.get(any())).thenReturn(Optional.of(projectState));
+    when(permissionBackend.currentUser()).thenReturn(currentUser);
+    when(currentUser.project(any())).thenReturn(forProject);
+    when(forProject.ref(any())).thenReturn(forRef);
+    when(gitManager.openRepository(any())).thenReturn(repository);
+    when(repository.updateRef(any())).thenReturn(refUpdate);
+    when(repository.getRefDatabase()).thenReturn(refDb);
+    when(refDb.exactRef(anyString())).thenReturn(currentRef);
+    when(refUpdate.delete()).thenReturn(Result.FORCED);
 
     objectUnderTest =
-        new DeleteRefCommand(fetchStateLog, projectCache, deleteRef, eventDispatcherDataItem);
+        new DeleteRefCommand(
+            fetchStateLog,
+            projectCache,
+            applyObject,
+            permissionBackend,
+            eventDispatcherDataItem,
+            gitManager);
   }
 
   @Test
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchActionTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchActionTest.java
index 8fd4b78..ce0b9d3 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchActionTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchActionTest.java
@@ -67,7 +67,7 @@
 
   @Before
   public void setup() {
-    when(fetchJobFactory.create(any(), any())).thenReturn(fetchJob);
+    when(fetchJobFactory.create(any(), any(), any())).thenReturn(fetchJob);
     when(workQueue.getDefaultQueue()).thenReturn(exceutorService);
     when(urlFormatter.getRestUrl(anyString())).thenReturn(Optional.of(location));
     when(exceutorService.submit(any(Runnable.class)))
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommandTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommandTest.java
index e1ad565..9af2d10 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommandTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/api/FetchCommandTest.java
@@ -35,6 +35,7 @@
 import com.googlesource.gerrit.plugins.replication.pull.SourcesCollection;
 import com.googlesource.gerrit.plugins.replication.pull.api.exception.RemoteConfigurationMissingException;
 import java.net.URISyntaxException;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
@@ -56,6 +57,7 @@
   @Mock Source source;
   @Mock SourcesCollection sources;
   @Mock DynamicItem<EventDispatcher> eventDispatcher;
+  @Mock PullReplicationApiRequestMetrics apiRequestMetrics;
 
   @SuppressWarnings("rawtypes")
   @Mock
@@ -76,7 +78,7 @@
     when(fetchReplicationStateFactory.create(any())).thenReturn(state);
     when(source.getRemoteConfigName()).thenReturn(label);
     when(sources.getAll()).thenReturn(Lists.newArrayList(source));
-    when(source.schedule(eq(projectName), eq(REF_NAME_TO_FETCH), eq(state), any()))
+    when(source.schedule(eq(projectName), eq(REF_NAME_TO_FETCH), eq(state), any(), any()))
         .thenReturn(CompletableFuture.completedFuture(null));
     objectUnderTest =
         new FetchCommand(fetchReplicationStateFactory, fetchStateLog, sources, eventDispatcher);
@@ -88,16 +90,18 @@
           TimeoutException {
     objectUnderTest.fetchSync(projectName, label, REF_NAME_TO_FETCH);
 
-    verify(source, times(1)).schedule(projectName, REF_NAME_TO_FETCH, state, SYNC);
+    verify(source, times(1))
+        .schedule(projectName, REF_NAME_TO_FETCH, state, SYNC, Optional.empty());
   }
 
   @Test
   public void shouldScheduleRefFetchWithDelay()
       throws InterruptedException, ExecutionException, RemoteConfigurationMissingException,
           TimeoutException {
-    objectUnderTest.fetchAsync(projectName, label, REF_NAME_TO_FETCH);
+    objectUnderTest.fetchAsync(projectName, label, REF_NAME_TO_FETCH, apiRequestMetrics);
 
-    verify(source, times(1)).schedule(projectName, REF_NAME_TO_FETCH, state, ASYNC);
+    verify(source, times(1))
+        .schedule(projectName, REF_NAME_TO_FETCH, state, ASYNC, Optional.of(apiRequestMetrics));
   }
 
   @Test
@@ -106,7 +110,8 @@
           TimeoutException {
     objectUnderTest.fetchSync(projectName, label, REF_NAME_TO_FETCH);
 
-    verify(source, times(1)).schedule(projectName, REF_NAME_TO_FETCH, state, SYNC);
+    verify(source, times(1))
+        .schedule(projectName, REF_NAME_TO_FETCH, state, SYNC, Optional.empty());
     verify(state, times(1)).markAllFetchTasksScheduled();
   }
 
@@ -123,7 +128,8 @@
   public void shouldUpdateStateWhenInterruptedException()
       throws InterruptedException, ExecutionException, TimeoutException {
     when(future.get(anyLong(), eq(TimeUnit.SECONDS))).thenThrow(new InterruptedException());
-    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC)).thenReturn(future);
+    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC, Optional.empty()))
+        .thenReturn(future);
 
     InterruptedException e =
         assertThrows(
@@ -138,7 +144,8 @@
       throws InterruptedException, ExecutionException, TimeoutException {
     when(future.get(anyLong(), eq(TimeUnit.SECONDS)))
         .thenThrow(new ExecutionException(new Exception()));
-    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC)).thenReturn(future);
+    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC, Optional.empty()))
+        .thenReturn(future);
 
     ExecutionException e =
         assertThrows(
@@ -152,7 +159,8 @@
   public void shouldUpdateStateWhenTimeoutException()
       throws InterruptedException, ExecutionException, TimeoutException {
     when(future.get(anyLong(), eq(TimeUnit.SECONDS))).thenThrow(new TimeoutException());
-    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC)).thenReturn(future);
+    when(source.schedule(projectName, REF_NAME_TO_FETCH, state, SYNC, Optional.empty()))
+        .thenReturn(future);
 
     TimeoutException e =
         assertThrows(
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClientTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClientTest.java
index f0b8b99..00904c7 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClientTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/FetchRestApiClientTest.java
@@ -38,6 +38,7 @@
 import java.io.InputStreamReader;
 import java.net.URISyntaxException;
 import java.nio.ByteBuffer;
+import java.util.Collections;
 import java.util.Optional;
 import org.apache.http.Header;
 import org.apache.http.client.ClientProtocolException;
@@ -89,10 +90,22 @@
   Header expectedHeader = new BasicHeader("Content-Type", "application/json");
   SyncRefsFilter syncRefsFilter;
 
+  String commitObjectId = "9f8d52853089a3cf00c02ff7bd0817bd4353a95a";
+  String treeObjectId = "77814d216a6cab2ddb9f2877fbbd0febdc0fa608";
+  String blobObjectId = "bb383f5249c68a4cc8c82bdd1228b4a8883ff6e8";
+
   String expectedSendObjectPayload =
-      "{\"label\":\"Replication\",\"ref_name\":\"refs/heads/master\",\"revision_data\":{\"commit_object\":{\"type\":1,\"content\":\"dHJlZSA3NzgxNGQyMTZhNmNhYjJkZGI5ZjI4NzdmYmJkMGZlYmRjMGZhNjA4CnBhcmVudCA5ODNmZjFhM2NmNzQ3MjVhNTNhNWRlYzhkMGMwNjEyMjEyOGY1YThkCmF1dGhvciBHZXJyaXQgVXNlciAxMDAwMDAwIDwxMDAwMDAwQDY5ZWMzOGYwLTM1MGUtNGQ5Yy05NmQ0LWJjOTU2ZjJmYWFhYz4gMTYxMDU3ODY0OCArMDEwMApjb21taXR0ZXIgR2Vycml0IENvZGUgUmV2aWV3IDxyb290QG1hY3plY2gtWFBTLTE1PiAxNjEwNTc4NjQ4ICswMTAwCgpVcGRhdGUgcGF0Y2ggc2V0IDEKClBhdGNoIFNldCAxOgoKKDEgY29tbWVudCkKClBhdGNoLXNldDogMQo\\u003d\"},\"tree_object\":{\"type\":2,\"content\":\"MTAwNjQ0IGJsb2IgYmIzODNmNTI0OWM2OGE0Y2M4YzgyYmRkMTIyOGI0YTg4ODNmZjZlOCAgICBmNzVhNjkwMDRhOTNiNGNjYzhjZTIxNWMxMjgwODYzNmMyYjc1Njc1\"},\"blobs\":[{\"type\":3,\"content\":\"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\\u003d\"}]}}";
+      "{\"label\":\"Replication\",\"ref_name\":\"refs/heads/master\",\"revision_data\":{\"commit_object\":{\"sha1\":\""
+          + commitObjectId
+          + "\",\"type\":1,\"content\":\"dHJlZSA3NzgxNGQyMTZhNmNhYjJkZGI5ZjI4NzdmYmJkMGZlYmRjMGZhNjA4CnBhcmVudCA5ODNmZjFhM2NmNzQ3MjVhNTNhNWRlYzhkMGMwNjEyMjEyOGY1YThkCmF1dGhvciBHZXJyaXQgVXNlciAxMDAwMDAwIDwxMDAwMDAwQDY5ZWMzOGYwLTM1MGUtNGQ5Yy05NmQ0LWJjOTU2ZjJmYWFhYz4gMTYxMDU3ODY0OCArMDEwMApjb21taXR0ZXIgR2Vycml0IENvZGUgUmV2aWV3IDxyb290QG1hY3plY2gtWFBTLTE1PiAxNjEwNTc4NjQ4ICswMTAwCgpVcGRhdGUgcGF0Y2ggc2V0IDEKClBhdGNoIFNldCAxOgoKKDEgY29tbWVudCkKClBhdGNoLXNldDogMQo\\u003d\"},\"tree_object\":{\"sha1\":\""
+          + treeObjectId
+          + "\",\"type\":2,\"content\":\"MTAwNjQ0IGJsb2IgYmIzODNmNTI0OWM2OGE0Y2M4YzgyYmRkMTIyOGI0YTg4ODNmZjZlOCAgICBmNzVhNjkwMDRhOTNiNGNjYzhjZTIxNWMxMjgwODYzNmMyYjc1Njc1\"},\"blobs\":[{\"sha1\":\""
+          + blobObjectId
+          + "\",\"type\":3,\"content\":\"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\\u003d\"}]}}";
   String commitObject =
-      "tree 77814d216a6cab2ddb9f2877fbbd0febdc0fa608\n"
+      "tree "
+          + treeObjectId
+          + "\n"
           + "parent 983ff1a3cf74725a53a5dec8d0c06122128f5a8d\n"
           + "author Gerrit User 1000000 <1000000@69ec38f0-350e-4d9c-96d4-bc956f2faaac> 1610578648 +0100\n"
           + "committer Gerrit Code Review <root@maczech-XPS-15> 1610578648 +0100\n"
@@ -105,7 +118,7 @@
           + "\n"
           + "Patch-set: 1\n";
   String treeObject =
-      "100644 blob bb383f5249c68a4cc8c82bdd1228b4a8883ff6e8    f75a69004a93b4ccc8ce215c12808636c2b75675";
+      "100644 blob " + blobObjectId + "    f75a69004a93b4ccc8ce215c12808636c2b75675";
   String blobObject =
       "{\n"
           + "  \"comments\": [\n"
@@ -460,9 +473,12 @@
 
   private RevisionData createSampleRevisionData() {
     RevisionObjectData commitData =
-        new RevisionObjectData(Constants.OBJ_COMMIT, commitObject.getBytes());
-    RevisionObjectData treeData = new RevisionObjectData(Constants.OBJ_TREE, treeObject.getBytes());
-    RevisionObjectData blobData = new RevisionObjectData(Constants.OBJ_BLOB, blobObject.getBytes());
-    return new RevisionData(commitData, treeData, Lists.newArrayList(blobData));
+        new RevisionObjectData(commitObjectId, Constants.OBJ_COMMIT, commitObject.getBytes());
+    RevisionObjectData treeData =
+        new RevisionObjectData(treeObjectId, Constants.OBJ_TREE, treeObject.getBytes());
+    RevisionObjectData blobData =
+        new RevisionObjectData(blobObjectId, Constants.OBJ_BLOB, blobObject.getBytes());
+    return new RevisionData(
+        Collections.emptyList(), commitData, treeData, Lists.newArrayList(blobData));
   }
 }
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResultTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResultTest.java
new file mode 100644
index 0000000..d82f3a5
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/client/HttpResultTest.java
@@ -0,0 +1,55 @@
+// Copyright (C) 2022 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.replication.pull.client;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.util.Arrays;
+import java.util.Optional;
+import javax.servlet.http.HttpServletResponse;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class HttpResultTest {
+
+  @Parameterized.Parameters(name = "HTTP Status = {0} is successful: {1}")
+  public static Iterable<Object[]> data() {
+    return Arrays.asList(
+        new Object[][] {
+          {HttpServletResponse.SC_OK, true},
+          {HttpServletResponse.SC_CREATED, true},
+          {HttpServletResponse.SC_ACCEPTED, true},
+          {HttpServletResponse.SC_NO_CONTENT, true},
+          {HttpServletResponse.SC_BAD_REQUEST, false},
+          {HttpServletResponse.SC_CONFLICT, false}
+        });
+  }
+
+  private Integer httpStatus;
+  private boolean isSuccessful;
+
+  public HttpResultTest(Integer httpStatus, Boolean isSuccessful) {
+    this.httpStatus = httpStatus;
+    this.isSuccessful = isSuccessful;
+  }
+
+  @Test
+  public void httpResultIsSuccessful() {
+    HttpResult httpResult = new HttpResult(httpStatus, Optional.empty());
+    assertThat(httpResult.isSuccessful()).isEqualTo(isSuccessful);
+  }
+}
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListenerTest.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListenerTest.java
index 655575f..c673011 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListenerTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/event/StreamEventListenerTest.java
@@ -34,6 +34,7 @@
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchAction.Input;
 import com.googlesource.gerrit.plugins.replication.pull.api.FetchJob;
 import com.googlesource.gerrit.plugins.replication.pull.api.ProjectInitializationAction;
+import com.googlesource.gerrit.plugins.replication.pull.api.PullReplicationApiRequestMetrics;
 import java.util.concurrent.ScheduledExecutorService;
 import org.eclipse.jgit.lib.ObjectId;
 import org.junit.Before;
@@ -58,16 +59,18 @@
   @Mock private FetchJob fetchJob;
   @Mock private FetchJob.Factory fetchJobFactory;
   @Captor ArgumentCaptor<Input> inputCaptor;
+  @Mock private PullReplicationApiRequestMetrics metrics;
 
   private StreamEventListener objectUnderTest;
 
   @Before
   public void setup() {
     when(workQueue.getDefaultQueue()).thenReturn(executor);
-    when(fetchJobFactory.create(eq(Project.nameKey(TEST_PROJECT)), any())).thenReturn(fetchJob);
+    when(fetchJobFactory.create(eq(Project.nameKey(TEST_PROJECT)), any(), any()))
+        .thenReturn(fetchJob);
     objectUnderTest =
         new StreamEventListener(
-            INSTANCE_ID, projectInitializationAction, workQueue, fetchJobFactory);
+            INSTANCE_ID, projectInitializationAction, workQueue, fetchJobFactory, () -> metrics);
   }
 
   @Test
@@ -107,7 +110,7 @@
 
     objectUnderTest.onEvent(event);
 
-    verify(fetchJobFactory).create(eq(Project.nameKey(TEST_PROJECT)), inputCaptor.capture());
+    verify(fetchJobFactory).create(eq(Project.nameKey(TEST_PROJECT)), inputCaptor.capture(), any());
 
     Input input = inputCaptor.getValue();
     assertThat(input.label).isEqualTo(REMOTE_INSTANCE_ID);
@@ -136,7 +139,7 @@
 
     objectUnderTest.onEvent(event);
 
-    verify(fetchJobFactory).create(eq(Project.nameKey(TEST_PROJECT)), inputCaptor.capture());
+    verify(fetchJobFactory).create(eq(Project.nameKey(TEST_PROJECT)), inputCaptor.capture(), any());
 
     Input input = inputCaptor.getValue();
     assertThat(input.label).isEqualTo(REMOTE_INSTANCE_ID);
diff --git a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObjectIT.java b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObjectIT.java
index e2a162e..161830b 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObjectIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/replication/pull/fetch/ApplyObjectIT.java
@@ -79,14 +79,36 @@
 
     Optional<RevisionData> revisionData =
         reader.read(
-            Project.nameKey(testRepoProjectName), pushResult.getCommit().toObjectId(), refName);
+            Project.nameKey(testRepoProjectName), pushResult.getCommit().toObjectId(), refName, 0);
 
     RefSpec refSpec = new RefSpec(refName);
-    objectUnderTest.apply(project, refSpec, revisionData.get());
+    objectUnderTest.apply(project, refSpec, toArray(revisionData));
     try (Repository repo = repoManager.openRepository(project);
         TestRepository<Repository> testRepo = new TestRepository<>(repo); ) {
       Optional<RevisionData> newRevisionData =
-          reader.read(project, repo.exactRef(refName).getObjectId(), refName);
+          reader.read(project, repo.exactRef(refName).getObjectId(), refName, 0);
+      compareObjects(revisionData.get(), newRevisionData);
+      testRepo.fsck();
+    }
+  }
+
+  @Test
+  public void shouldApplyRefSequencesChanges() throws Exception {
+    String testRepoProjectName = project + TEST_REPLICATION_SUFFIX;
+    testRepo = cloneProject(createTestProject(testRepoProjectName));
+
+    createChange();
+    String seqChangesRef = RefNames.REFS_SEQUENCES + "changes";
+
+    Optional<RevisionData> revisionData = reader.read(allProjects, seqChangesRef, 0);
+
+    RefSpec refSpec = new RefSpec(seqChangesRef);
+    objectUnderTest.apply(project, refSpec, toArray(revisionData));
+    try (Repository repo = repoManager.openRepository(project);
+        TestRepository<Repository> testRepo = new TestRepository<>(repo); ) {
+
+      Optional<RevisionData> newRevisionData =
+          reader.read(project, repo.exactRef(seqChangesRef).getObjectId(), seqChangesRef, 0);
       compareObjects(revisionData.get(), newRevisionData);
       testRepo.fsck();
     }
@@ -105,8 +127,8 @@
     NameKey testRepoKey = Project.nameKey(testRepoProjectName);
     try (Repository repo = repoManager.openRepository(testRepoKey)) {
       Optional<RevisionData> revisionData =
-          reader.read(testRepoKey, repo.exactRef(refName).getObjectId(), refName);
-      objectUnderTest.apply(project, refSpec, revisionData.get());
+          reader.read(testRepoKey, repo.exactRef(refName).getObjectId(), refName, 0);
+      objectUnderTest.apply(project, refSpec, toArray(revisionData));
     }
 
     ReviewInput reviewInput = new ReviewInput();
@@ -117,12 +139,12 @@
     try (Repository repo = repoManager.openRepository(project);
         TestRepository<Repository> testRepo = new TestRepository<>(repo)) {
       Optional<RevisionData> revisionDataWithComment =
-          reader.read(testRepoKey, repo.exactRef(refName).getObjectId(), refName);
+          reader.read(testRepoKey, repo.exactRef(refName).getObjectId(), refName, 0);
 
-      objectUnderTest.apply(project, refSpec, revisionDataWithComment.get());
+      objectUnderTest.apply(project, refSpec, toArray(revisionDataWithComment));
 
       Optional<RevisionData> newRevisionData =
-          reader.read(project, repo.exactRef(refName).getObjectId(), refName);
+          reader.read(project, repo.exactRef(refName).getObjectId(), refName, 0);
 
       compareObjects(revisionDataWithComment.get(), newRevisionData);
 
@@ -147,12 +169,12 @@
       gApi.changes().id(changeId.get()).current().review(reviewInput);
 
       Optional<RevisionData> revisionData =
-          reader.read(createTestProject, repo.exactRef(refName).getObjectId(), refName);
+          reader.read(createTestProject, repo.exactRef(refName).getObjectId(), refName, 0);
 
       RefSpec refSpec = new RefSpec(refName);
       assertThrows(
           MissingParentObjectException.class,
-          () -> objectUnderTest.apply(project, refSpec, revisionData.get()));
+          () -> objectUnderTest.apply(project, refSpec, toArray(revisionData)));
     }
   }
 
@@ -173,6 +195,9 @@
   }
 
   private void compareContent(RevisionObjectData expected, RevisionObjectData actual) {
+    if (expected == actual) {
+      return;
+    }
     assertThat(actual.getType()).isEqualTo(expected.getType());
     assertThat(Bytes.asList(actual.getContent()))
         .containsExactlyElementsIn(Bytes.asList(expected.getContent()))
@@ -205,4 +230,10 @@
       bind(ApplyObject.class);
     }
   }
+
+  private RevisionData[] toArray(Optional<RevisionData> optional) {
+    ImmutableList.Builder<RevisionData> listBuilder = ImmutableList.builder();
+    optional.ifPresent(listBuilder::add);
+    return listBuilder.build().toArray(new RevisionData[1]);
+  }
 }