diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index 32867b6..90c69b6 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -4454,8 +4454,7 @@
 [[retry.retryWithTraceOnFailure]]retry.retryWithTraceOnFailure::
 +
 Whether Gerrit should automatically retry operations on failure with tracing
-enabled. The automatically generated traces can help with debugging. Please
-note that only some of the REST endpoints support automatic retry.
+enabled. The automatically generated traces can help with debugging.
 +
 By default this is set to false.
 
diff --git a/java/com/google/gerrit/server/account/AccountCacheImpl.java b/java/com/google/gerrit/server/account/AccountCacheImpl.java
index 93e04880..defa4c7 100644
--- a/java/com/google/gerrit/server/account/AccountCacheImpl.java
+++ b/java/com/google/gerrit/server/account/AccountCacheImpl.java
@@ -45,7 +45,6 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutionException;
-import org.eclipse.jgit.errors.ConfigInvalidException;
 import org.eclipse.jgit.lib.Ref;
 import org.eclipse.jgit.lib.Repository;
 
@@ -144,7 +143,7 @@
           .get(ExternalId.Key.create(SCHEME_USERNAME, username))
           .map(e -> get(e.accountId()))
           .orElseGet(Optional::empty);
-    } catch (IOException | ConfigInvalidException e) {
+    } catch (IOException e) {
       logger.atWarning().withCause(e).log("Cannot load AccountState for username %s", username);
       return Optional.empty();
     }
diff --git a/java/com/google/gerrit/server/account/AccountManager.java b/java/com/google/gerrit/server/account/AccountManager.java
index 2152e1e..5a89a862 100644
--- a/java/com/google/gerrit/server/account/AccountManager.java
+++ b/java/com/google/gerrit/server/account/AccountManager.java
@@ -114,7 +114,7 @@
   public Optional<Account.Id> lookup(String externalId) throws AccountException {
     try {
       return externalIds.get(ExternalId.Key.parse(externalId)).map(ExternalId::accountId);
-    } catch (IOException | ConfigInvalidException e) {
+    } catch (IOException e) {
       throw new AccountException("Cannot lookup account " + externalId, e);
     }
   }
diff --git a/java/com/google/gerrit/server/account/externalids/ExternalIds.java b/java/com/google/gerrit/server/account/externalids/ExternalIds.java
index 7b0dc57..4e1e524 100644
--- a/java/com/google/gerrit/server/account/externalids/ExternalIds.java
+++ b/java/com/google/gerrit/server/account/externalids/ExternalIds.java
@@ -53,7 +53,7 @@
   }
 
   /** Returns the specified external ID. */
-  public Optional<ExternalId> get(ExternalId.Key key) throws IOException, ConfigInvalidException {
+  public Optional<ExternalId> get(ExternalId.Key key) throws IOException {
     return externalIdCache.byKey(key);
   }
 
diff --git a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
index 65662ba..5e9ce97 100644
--- a/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
+++ b/java/com/google/gerrit/server/experiments/ExperimentFeaturesConstants.java
@@ -32,6 +32,14 @@
   public static final String GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_PUSH_CANCELLATION =
       "GerritBackendRequestFeature__enable_push_cencallation";
 
+  /**
+   * Allow legacy {@link com.google.gerrit.entities.SubmitRecord}s to be converted and returned as
+   * submit requirements by the {@link
+   * com.google.gerrit.server.project.SubmitRequirementsEvaluator}.
+   */
+  public static final String GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS =
+      "GerritBackendRequestFeature__enable_legacy_submit_requirements";
+
   /** Features, enabled by default in the current release. */
   public static final ImmutableSet<String> DEFAULT_ENABLED_FEATURES =
       ImmutableSet.of(UI_FEATURE_PATCHSET_COMMENTS);
diff --git a/java/com/google/gerrit/server/notedb/CommitRewriter.java b/java/com/google/gerrit/server/notedb/CommitRewriter.java
index d08f6c4..7d743dc 100644
--- a/java/com/google/gerrit/server/notedb/CommitRewriter.java
+++ b/java/com/google/gerrit/server/notedb/CommitRewriter.java
@@ -174,6 +174,10 @@
 
   private static final Pattern REMOVED_VOTE_PATTERN = Pattern.compile("Removed (.*) by (.*)");
 
+  private static final String REMOVED_VOTES_CHANGE_MESSAGE_START = "Removed the following votes:";
+  private static final Pattern REMOVED_VOTES_CHANGE_MESSAGE_PATTERN =
+      Pattern.compile("\\* (.*) by (.*)");
+
   private static final Pattern REMOVED_CHANGE_MESSAGE_PATTERN =
       Pattern.compile("Change message removed by: (.*)(\nReason: .*)?");
 
@@ -600,6 +604,34 @@
     return Optional.empty();
   }
 
+  private Optional<String> fixRemoveVotesChangeMessage(
+      ChangeFixProgress changeFixProgress, String originalChangeMessage) {
+    if (Strings.isNullOrEmpty(originalChangeMessage)
+        || !originalChangeMessage.startsWith(REMOVED_VOTES_CHANGE_MESSAGE_START)) {
+      return Optional.empty();
+    }
+    String[] lines = originalChangeMessage.split("\\r?\\n");
+    StringBuilder fixedLines = new StringBuilder();
+    for (int i = 1; i < lines.length; i++) {
+      if (lines[i].isEmpty()) {
+        continue;
+      }
+      Matcher matcher = REMOVED_VOTES_CHANGE_MESSAGE_PATTERN.matcher(lines[i]);
+      if (matcher.matches() && !NON_REPLACE_ACCOUNT_PATTERN.matcher(matcher.group(2)).matches()) {
+        fixedLines.append(
+            String.format(
+                "* %s by %s\n",
+                matcher.group(1),
+                getPossibleAccountReplacement(
+                    changeFixProgress, Optional.empty(), getNameFromNameEmail(matcher.group(2)))));
+      }
+    }
+    if (fixedLines.length() == 0) {
+      return Optional.empty();
+    }
+    return Optional.of(REMOVED_VOTES_CHANGE_MESSAGE_START + "\n" + fixedLines);
+  }
+
   private Optional<String> fixDeleteChangeMessageCommitMessage(String originalChangeMessage) {
     if (Strings.isNullOrEmpty(originalChangeMessage)) {
       return Optional.empty();
@@ -887,6 +919,9 @@
       fixedChangeMessage = fixReviewerChangeMessage(originalChangeMessage);
     }
     if (!fixedChangeMessage.isPresent()) {
+      fixedChangeMessage = fixRemoveVotesChangeMessage(fixProgress, originalChangeMessage);
+    }
+    if (!fixedChangeMessage.isPresent()) {
       fixedChangeMessage =
           fixRemoveVoteChangeMessage(fixProgress, Optional.empty(), originalChangeMessage);
     }
diff --git a/java/com/google/gerrit/server/patch/PatchScriptFactory.java b/java/com/google/gerrit/server/patch/PatchScriptFactory.java
index 28dde3b..6fa14e1 100644
--- a/java/com/google/gerrit/server/patch/PatchScriptFactory.java
+++ b/java/com/google/gerrit/server/patch/PatchScriptFactory.java
@@ -57,11 +57,9 @@
 import com.google.inject.assistedinject.Assisted;
 import com.google.inject.assistedinject.AssistedInject;
 import java.io.IOException;
-import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutorService;
 import org.eclipse.jgit.diff.Edit;
 import org.eclipse.jgit.errors.RepositoryNotFoundException;
 import org.eclipse.jgit.lib.ObjectId;
@@ -115,8 +113,6 @@
   private final PatchSetUtil psUtil;
   private final Provider<PatchScriptBuilder> builderFactory;
   private final PatchListCache patchListCache;
-  private final Metrics metrics;
-  private final ExecutorService executor;
 
   private final String fileName;
   @Nullable private final PatchSet.Id psa;
@@ -147,8 +143,6 @@
       PermissionBackend permissionBackend,
       ProjectCache projectCache,
       DiffOperations diffOperations,
-      Metrics metrics,
-      @DiffExecutor ExecutorService executor,
       @Assisted ChangeNotes notes,
       @Assisted String fileName,
       @Assisted("patchSetA") @Nullable PatchSet.Id patchSetA,
@@ -164,8 +158,6 @@
     this.permissionBackend = permissionBackend;
     this.projectCache = projectCache;
     this.diffOperations = diffOperations;
-    this.metrics = metrics;
-    this.executor = executor;
 
     this.fileName = fileName;
     this.psa = patchSetA;
@@ -191,8 +183,6 @@
       PermissionBackend permissionBackend,
       ProjectCache projectCache,
       DiffOperations diffOperations,
-      Metrics metrics,
-      @DiffExecutor ExecutorService executor,
       @Assisted ChangeNotes notes,
       @Assisted String fileName,
       @Assisted int parentNum,
@@ -208,8 +198,6 @@
     this.permissionBackend = permissionBackend;
     this.projectCache = projectCache;
     this.diffOperations = diffOperations;
-    this.metrics = metrics;
-    this.executor = executor;
 
     this.fileName = fileName;
     this.psa = null;
@@ -299,61 +287,6 @@
     return newBuilder().toPatchScriptNew(git, fileDiffOutput);
   }
 
-  /**
-   * The comparison is not exhaustive but is using the most important fields. Comparing all fields
-   * will require some work in {@link PatchScript} to, e.g., convert it to autovalue. This
-   * comparison method shall give a strong signal that both patchscripts are almost identical.
-   */
-  private static boolean areEqualPatchscripts(PatchScript ps1, PatchScript ps2) {
-    boolean equal = true;
-    if (!ps1.getChangeType().equals(ps2.getChangeType())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching change type: old = %s, new = %s.", ps1.getChangeType(), ps2.getChangeType());
-    }
-    if (!ps1.getPatchHeader().equals(ps2.getPatchHeader())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching patch header: old = %s, new = %s.",
-          ps1.getPatchHeader(), ps2.getPatchHeader());
-    }
-    if (!Objects.equals(ps1.getOldName(), ps2.getOldName())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching old name: old = %s, new = %s.", ps1.getOldName(), ps2.getOldName());
-    }
-    if (!Objects.equals(ps1.getNewName(), ps2.getNewName())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching new name: old = %s, new = %s.", ps1.getNewName(), ps2.getNewName());
-    }
-    if (!ps1.getEdits().containsAll(ps2.getEdits())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching edits: old = %s, new = %s.", ps1.getEdits(), ps2.getEdits());
-    }
-    if (!ps2.getEdits().containsAll(ps1.getEdits())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching edits: old = %s, new = %s.", ps1.getEdits(), ps2.getEdits());
-    }
-    if (!ps1.getEditsDueToRebase().equals(ps2.getEditsDueToRebase())) {
-      equal = false;
-      logger.atWarning().log(
-          "Mismatching edits due to rebase: old = %s, new = %s.",
-          ps1.getEditsDueToRebase(), ps2.getEditsDueToRebase());
-    }
-    if (!ps1.getA().equals(ps2.getA())) {
-      equal = false;
-      logger.atWarning().log("Mismatching sparse file content in old commit.");
-    }
-    if (!ps1.getB().equals(ps2.getB())) {
-      equal = false;
-      logger.atWarning().log("Mismatching sparse file content in new commit.");
-    }
-    return equal;
-  }
-
   private Optional<ObjectId> getAId() {
     if (psa == null) {
       return Optional.empty();
diff --git a/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiffCacheImpl.java b/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiffCacheImpl.java
index 6f93f2e..f293a64 100644
--- a/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiffCacheImpl.java
+++ b/java/com/google/gerrit/server/patch/gitfilediff/GitFileDiffCacheImpl.java
@@ -381,11 +381,13 @@
   }
 
   /**
-   * Create a single {@link GitFileDiff} with {@link Patch.ChangeType} equals {@link
-   * Patch.ChangeType#REWRITE}, assuming the input list contains two entries.
+   * Create a single {@link GitFileDiff} with {@link com.google.gerrit.entities.Patch.ChangeType}
+   * equals {@link com.google.gerrit.entities.Patch.ChangeType#REWRITE}, assuming the input list
+   * contains two entries.
    *
    * @param gitDiffs input list of exactly two {@link GitFileDiff} for same file path.
-   * @return a single {@link GitFileDiff} with change type equals {@link Patch.ChangeType#REWRITE}.
+   * @return a single {@link GitFileDiff} with change type equals {@link
+   *     com.google.gerrit.entities.Patch.ChangeType#REWRITE}.
    * @throws DiffNotAvailableException if input list contains git diffs with change types other than
    *     {ADDED, DELETED}. This is a JGit error.
    */
diff --git a/java/com/google/gerrit/server/project/ProjectCreator.java b/java/com/google/gerrit/server/project/ProjectCreator.java
index c38cdfa..4e778a4 100644
--- a/java/com/google/gerrit/server/project/ProjectCreator.java
+++ b/java/com/google/gerrit/server/project/ProjectCreator.java
@@ -30,7 +30,6 @@
 import com.google.gerrit.entities.RefNames;
 import com.google.gerrit.extensions.events.NewProjectCreatedListener;
 import com.google.gerrit.extensions.restapi.BadRequestException;
-import com.google.gerrit.extensions.restapi.PreconditionFailedException;
 import com.google.gerrit.extensions.restapi.ResourceConflictException;
 import com.google.gerrit.git.LockFailureException;
 import com.google.gerrit.server.GerritPersonIdent;
@@ -105,8 +104,7 @@
   }
 
   public ProjectState createProject(CreateProjectArgs args)
-      throws BadRequestException, ResourceConflictException, IOException, ConfigInvalidException,
-          PreconditionFailedException {
+      throws BadRequestException, ResourceConflictException, IOException, ConfigInvalidException {
     final Project.NameKey nameKey = args.getProject();
     try {
       final String head = args.permissionsOnly ? RefNames.REFS_CONFIG : args.branch.get(0);
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java b/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
index f43e6b4..5d8b99a 100644
--- a/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsAdapter.java
@@ -132,6 +132,9 @@
         return ImmutableList.of(String.format(String.format("-label:%s=MIN", lt.getName())));
       case MAX_NO_BLOCK:
         return ImmutableList.of(String.format(String.format("label:%s=MAX", lt.getName())));
+      case NO_BLOCK:
+      case NO_OP:
+      case PATCH_SET_LOCK:
       default:
         return ImmutableList.of();
     }
diff --git a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
index 36377e9..9be50c7 100644
--- a/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
+++ b/java/com/google/gerrit/server/project/SubmitRequirementsEvaluatorImpl.java
@@ -17,6 +17,8 @@
 import static com.google.gerrit.server.project.ProjectCache.illegalState;
 
 import com.google.common.collect.ImmutableMap;
+import com.google.gerrit.entities.LabelType;
+import com.google.gerrit.entities.SubmitRecord;
 import com.google.gerrit.entities.SubmitRequirement;
 import com.google.gerrit.entities.SubmitRequirementExpression;
 import com.google.gerrit.entities.SubmitRequirementExpressionResult;
@@ -24,6 +26,8 @@
 import com.google.gerrit.entities.SubmitRequirementResult;
 import com.google.gerrit.index.query.Predicate;
 import com.google.gerrit.index.query.QueryParseException;
+import com.google.gerrit.server.experiments.ExperimentFeatures;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder;
 import com.google.inject.AbstractModule;
@@ -31,13 +35,21 @@
 import com.google.inject.Module;
 import com.google.inject.Provider;
 import com.google.inject.Scopes;
+import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import org.eclipse.jgit.lib.ObjectId;
 
 /** Evaluates submit requirements for different change data. */
 public class SubmitRequirementsEvaluatorImpl implements SubmitRequirementsEvaluator {
+
   private final Provider<ChangeQueryBuilder> changeQueryBuilderProvider;
   private final ProjectCache projectCache;
+  private final SubmitRuleEvaluator.Factory legacyEvaluator;
+  private final ExperimentFeatures experimentFeatures;
 
   public static Module module() {
     return new AbstractModule() {
@@ -52,9 +64,14 @@
 
   @Inject
   private SubmitRequirementsEvaluatorImpl(
-      Provider<ChangeQueryBuilder> changeQueryBuilderProvider, ProjectCache projectCache) {
+      Provider<ChangeQueryBuilder> changeQueryBuilderProvider,
+      ProjectCache projectCache,
+      SubmitRuleEvaluator.Factory legacyEvaluator,
+      ExperimentFeatures experimentFeatures) {
     this.changeQueryBuilderProvider = changeQueryBuilderProvider;
     this.projectCache = projectCache;
+    this.legacyEvaluator = legacyEvaluator;
+    this.experimentFeatures = experimentFeatures;
   }
 
   @Override
@@ -65,14 +82,13 @@
 
   @Override
   public Map<SubmitRequirement, SubmitRequirementResult> evaluateAllRequirements(ChangeData cd) {
-    ProjectState state = projectCache.get(cd.project()).orElseThrow(illegalState(cd.project()));
-    Map<String, SubmitRequirement> requirements = state.getSubmitRequirements();
-    ImmutableMap.Builder<SubmitRequirement, SubmitRequirementResult> result =
-        ImmutableMap.builderWithExpectedSize(requirements.size());
-    for (SubmitRequirement requirement : requirements.values()) {
-      result.put(requirement, evaluateRequirement(requirement, cd));
+    Map<SubmitRequirement, SubmitRequirementResult> result = getRequirements(cd);
+    if (experimentFeatures.isFeatureEnabled(
+        ExperimentFeaturesConstants
+            .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)) {
+      result.putAll(getLegacyRequirements(cd));
     }
-    return result.build();
+    return ImmutableMap.copyOf(result);
   }
 
   @Override
@@ -113,6 +129,34 @@
     }
   }
 
+  /** Evaluate and return submit requirements stored in this project's config and its parents. */
+  private Map<SubmitRequirement, SubmitRequirementResult> getRequirements(ChangeData cd) {
+    ProjectState state = projectCache.get(cd.project()).orElseThrow(illegalState(cd.project()));
+    Map<String, SubmitRequirement> requirements = state.getSubmitRequirements();
+    Map<SubmitRequirement, SubmitRequirementResult> result = new HashMap<>();
+    for (SubmitRequirement requirement : requirements.values()) {
+      result.put(requirement, evaluateRequirement(requirement, cd));
+    }
+    return result;
+  }
+
+  /**
+   * Convert and return legacy submit records (created by label functions and other {@link
+   * com.google.gerrit.server.rules.SubmitRule}s to submit requirement results.
+   */
+  private Map<SubmitRequirement, SubmitRequirementResult> getLegacyRequirements(ChangeData cd) {
+    // We use SubmitRuleOptions.defaults() which does not recompute submit rules for closed changes.
+    // This doesn't have an effect since we never call this class (i.e. to evaluate submit
+    // requirements) for closed changes.
+    List<SubmitRecord> records = legacyEvaluator.create(SubmitRuleOptions.defaults()).evaluate(cd);
+    List<LabelType> labelTypes = cd.getLabelTypes().getLabelTypes();
+    ObjectId commitId = cd.currentPatchSet().commitId();
+    return records.stream()
+        .map(r -> SubmitRequirementsAdapter.createResult(r, labelTypes, commitId))
+        .flatMap(List::stream)
+        .collect(Collectors.toMap(sr -> sr.submitRequirement(), Function.identity()));
+  }
+
   /** Evaluate the predicate recursively using change data. */
   private PredicateResult evaluatePredicateTree(
       Predicate<ChangeData> predicate, ChangeData changeData) {
diff --git a/java/com/google/gerrit/server/query/change/IsWatchedByPredicate.java b/java/com/google/gerrit/server/query/change/IsWatchedByPredicate.java
index 8995740..054a69e 100644
--- a/java/com/google/gerrit/server/query/change/IsWatchedByPredicate.java
+++ b/java/com/google/gerrit/server/query/change/IsWatchedByPredicate.java
@@ -81,9 +81,8 @@
     }
     if (r.isEmpty()) {
       return ImmutableList.of(ChangeIndexPredicate.none());
-    } else {
-      return ImmutableList.of(or(r));
     }
+    return ImmutableList.of(or(r));
   }
 
   protected static Collection<ProjectWatchKey> getWatches(ChangeQueryBuilder.Arguments args)
diff --git a/java/com/google/gerrit/server/update/RetryHelper.java b/java/com/google/gerrit/server/update/RetryHelper.java
index b846662..2249b0e 100644
--- a/java/com/google/gerrit/server/update/RetryHelper.java
+++ b/java/com/google/gerrit/server/update/RetryHelper.java
@@ -548,8 +548,8 @@
    * @param retryer the retryer
    * @param listener metric listener
    * @return the result of executing the action
-   * @throws Throwable any error or exception that made the action fail, callers are expected to
-   *     catch and inspect this Throwable to decide carefully whether it should be re-thrown
+   * @throws Exception any exception that made the action fail, callers are expected to catch and
+   *     inspect this exception to decide carefully whether it should be re-thrown
    */
   private <T> T executeWithTimeoutCount(
       String actionType,
diff --git a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
index 9d9c411..ac43078 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
@@ -169,6 +169,7 @@
 import com.google.gerrit.server.change.ChangeMessages;
 import com.google.gerrit.server.change.ChangeResource;
 import com.google.gerrit.server.change.testing.TestChangeETagComputation;
+import com.google.gerrit.server.experiments.ExperimentFeaturesConstants;
 import com.google.gerrit.server.git.ChangeMessageModifier;
 import com.google.gerrit.server.group.SystemGroupBackend;
 import com.google.gerrit.server.index.change.ChangeIndex;
@@ -4404,6 +4405,62 @@
   }
 
   @Test
+  @GerritConfig(
+      name = "experiments.enabled",
+      value =
+          ExperimentFeaturesConstants
+              .GERRIT_BACKEND_REQUEST_FEATURE_ENABLE_LEGACY_SUBMIT_REQUIREMENTS)
+  public void submitRequirements_ReturnForLegacySubmitRecords_IfEnabled() throws Exception {
+    configLabel("build-cop-override", LabelFunction.MAX_WITH_BLOCK);
+    projectOperations
+        .project(project)
+        .forUpdate()
+        .add(
+            allowLabel("build-cop-override")
+                .ref("refs/heads/master")
+                .group(REGISTERED_USERS)
+                .range(-1, 1))
+        .update();
+
+    // 1. Project has two legacy requirements: Code-Review and bco. Both unsatisfied.
+    PushOneCommit.Result r = createChange();
+    String changeId = r.getChangeId();
+    ChangeInfo change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.UNSATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "build-cop-override", Status.UNSATISFIED, /* isLegacy= */ true);
+
+    // 2. Vote +1 on bco. bco becomes satisfied
+    voteLabel(changeId, "build-cop-override", 1);
+    change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.UNSATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "build-cop-override", Status.SATISFIED, /* isLegacy= */ true);
+
+    // 3. Vote +1 on Code-Review. Code-Review becomes satisfied
+    voteLabel(changeId, "Code-Review", 2);
+    change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "build-cop-override", Status.SATISFIED, /* isLegacy= */ true);
+
+    // 4. Merge the change. Submit requirements status is presented from NoteDb.
+    gApi.changes().id(changeId).current().submit();
+    change = gApi.changes().id(changeId).get();
+    assertThat(change.submitRequirements).hasSize(2);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "Code-Review", Status.SATISFIED, /* isLegacy= */ true);
+    assertSubmitRequirementStatus(
+        change.submitRequirements, "build-cop-override", Status.SATISFIED, /* isLegacy= */ true);
+  }
+
+  @Test
   public void submitRequirement_backFilledFromIndexForActiveChanges() throws Exception {
     configSubmitRequirement(
         project,
diff --git a/javatests/com/google/gerrit/acceptance/server/notedb/ExternalIdNotesUpsertPreprocessorIT.java b/javatests/com/google/gerrit/acceptance/server/notedb/ExternalIdNotesUpsertPreprocessorIT.java
index 64ad900..0fc42ff 100644
--- a/javatests/com/google/gerrit/acceptance/server/notedb/ExternalIdNotesUpsertPreprocessorIT.java
+++ b/javatests/com/google/gerrit/acceptance/server/notedb/ExternalIdNotesUpsertPreprocessorIT.java
@@ -24,7 +24,6 @@
 import com.google.gerrit.exceptions.StorageException;
 import com.google.gerrit.extensions.annotations.Exports;
 import com.google.gerrit.server.ServerInitiated;
-import com.google.gerrit.server.account.Accounts;
 import com.google.gerrit.server.account.AccountsUpdate;
 import com.google.gerrit.server.account.externalids.ExternalId;
 import com.google.gerrit.server.account.externalids.ExternalIdNotes;
@@ -50,7 +49,6 @@
   @Inject private Sequences sequences;
   @Inject private @ServerInitiated Provider<AccountsUpdate> accountsUpdateProvider;
   @Inject private ExternalIdNotes.Factory extIdNotesFactory;
-  @Inject private Accounts accounts;
 
   public static class Module extends AbstractModule {
     @Override
diff --git a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
index 68db634..26e1881 100644
--- a/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
+++ b/javatests/com/google/gerrit/server/notedb/CommitRewriterTest.java
@@ -837,6 +837,67 @@
   }
 
   @Test
+  public void fixRemoveVotesChangeMessage() throws Exception {
+    Change c = newChange();
+    ChangeUpdate approvalUpdate = newUpdate(c, changeOwner);
+    approvalUpdate.putApproval(VERIFIED, (short) +2);
+
+    approvalUpdate.putApprovalFor(otherUserId, VERIFIED, (short) -1);
+    approvalUpdate.commit();
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+
+        // Even though footer is missing, accounts are matched among the account in change updates.
+        getChangeUpdateBody(
+            c,
+            /*changeMessage=*/ "Removed the following votes:\n"
+                + String.format("* Verified-1 by %s\n", otherUser.getNameEmail())),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c,
+            /*changeMessage=*/ "Removed the following votes:\n"
+                + String.format("* Verified+2 by %s\n", changeOwner.getNameEmail())
+                + String.format("* Verified-1 by %s\n", changeOwner.getNameEmail())
+                + String.format("* Code-Review by %s\n", otherUser.getNameEmail())),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    // No rewrite for default
+    writeUpdate(
+        RefNames.changeMetaRef(c.getId()),
+        getChangeUpdateBody(
+            c,
+            /*changeMessage=*/ "Removed the following votes:\n"
+                + "* Verified+2 by Gerrit Account\n"
+                + "* Verified-1 by <GERRIT_ACCOUNT_2>\n"),
+        getAuthorIdent(changeOwner.getAccount()));
+
+    RunOptions options = new RunOptions();
+    options.dryRun = false;
+    BackfillResult result = rewriter.backfillProject(project, repo, options);
+    assertThat(result.fixedRefDiff.keySet()).containsExactly(RefNames.changeMetaRef(c.getId()));
+
+    List<String> commitHistoryDiff = commitHistoryDiff(result, c.getId());
+    assertThat(commitHistoryDiff)
+        .containsExactly(
+            "@@ -7 +7 @@\n"
+                + "-* Verified-1 by Other Account <other@account.com>\n"
+                + "+* Verified-1 by <GERRIT_ACCOUNT_2>\n",
+            "@@ -7,3 +7,3 @@\n"
+                + "-* Verified+2 by Change Owner <change@owner.com>\n"
+                + "-* Verified-1 by Change Owner <change@owner.com>\n"
+                + "-* Code-Review by Other Account <other@account.com>\n"
+                + "+* Verified+2 by <GERRIT_ACCOUNT_1>\n"
+                + "+* Verified-1 by <GERRIT_ACCOUNT_1>\n"
+                + "+* Code-Review by <GERRIT_ACCOUNT_2>\n");
+    BackfillResult secondRunResult = rewriter.backfillProject(project, repo, options);
+    assertThat(secondRunResult.fixedRefDiff.keySet()).isEmpty();
+    assertThat(secondRunResult.refsFailedToFix).isEmpty();
+  }
+
+  @Test
   public void fixAttentionFooter() throws Exception {
     Change c = newChange();
     ImmutableList.Builder<ObjectId> commitsToFix = new ImmutableList.Builder<>();
diff --git a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
index 06e3502..5358d01 100644
--- a/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
+++ b/javatests/com/google/gerrit/server/query/change/AbstractQueryChangesTest.java
@@ -630,7 +630,7 @@
     Change change1 = createChange(repo, johnDoe);
     Change change2 = createChange(repo, john);
     Change change3 = createChange(repo, doeSmith);
-    Change change4 = createChange(repo, selfName);
+    createChange(repo, selfName);
 
     // Only email address.
     assertQuery(searchOperator + "john.doe@example.com", change1);
@@ -2292,7 +2292,7 @@
     try (Registration registration =
         extensionRegistry.newRegistration().add(new FakeSubmitRule())) {
       TestRepository<Repo> repo = createProject("repo");
-      Change change = insert(repo, newChange(repo));
+      insert(repo, newChange(repo));
       assertQuery("rule:non-existent-rule");
     }
   }
diff --git a/plugins/package.json b/plugins/package.json
index f761be9..4e3c376 100644
--- a/plugins/package.json
+++ b/plugins/package.json
@@ -5,7 +5,7 @@
     "dependencies": {
       "@polymer/decorators": "^3.0.0",
       "@polymer/polymer": "^3.4.1",
-      "@gerritcodereview/typescript-api": "3.4.2",
+      "@gerritcodereview/typescript-api": "3.4.4",
       "lit": "2.0.0-rc.3"
     },
     "license": "Apache-2.0",
diff --git a/plugins/yarn.lock b/plugins/yarn.lock
index 1faa71a..3ff1cc4 100644
--- a/plugins/yarn.lock
+++ b/plugins/yarn.lock
@@ -2,10 +2,10 @@
 # yarn lockfile v1
 
 
-"@gerritcodereview/typescript-api@3.4.2":
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/@gerritcodereview/typescript-api/-/typescript-api-3.4.2.tgz#79e8ff336608cbf18e651bfa9541d7bdead5e1f9"
-  integrity sha512-iqHd6G43pV4Wk5iNw95AQmWUBuIrY+dvQ1Ne8ZYkOwRhdruh4BAPhMtsmqWDlcVQbfcwZD5F2zFkGB4J4htggw==
+"@gerritcodereview/typescript-api@3.4.4":
+  version "3.4.4"
+  resolved "https://registry.yarnpkg.com/@gerritcodereview/typescript-api/-/typescript-api-3.4.4.tgz#9f09687038088dd7edd3b4e30d249502eb21bfbc"
+  integrity sha512-MAiQwntcQ59b92yYDsVIXj3oBbAB4C7HELkLFFbYs4ZjzC43XqqtR9VF0dh5OUC8wzFZttgUiOmGehk9edpPuw==
 
 "@lit/reactive-element@^1.0.0-rc.2":
   version "1.0.0-rc.2"
diff --git a/polygerrit-ui/app/api/BUILD_for_publishing_api_only b/polygerrit-ui/app/api/BUILD_for_publishing_api_only
new file mode 100644
index 0000000..9d3029b
--- /dev/null
+++ b/polygerrit-ui/app/api/BUILD_for_publishing_api_only
@@ -0,0 +1,50 @@
+# This BUILD file is only for publishing the
+# "Gerrit Frontend Plugin TypeScript API" as an npm package.
+#
+# Publishing procedure:
+# - Execute the `publish.sh` script from the Gerrit root dir.
+# - Verify that the contents look good.
+# - Increment the version in package.json.
+# - Execute `publish.sh --upload`.
+#
+# NB: Renaming to 'BUILD' breaks the app/BUILD, because then the api/ sources
+# are not visible anymore to the parent BUILD. And if ts_projects depend on each
+# other, then the api/ files would have to be imported with their full package
+# names.
+load("@build_bazel_rules_nodejs//:index.bzl", "pkg_npm")
+load("@npm//@bazel/typescript:index.bzl", "ts_config", "ts_project")
+
+filegroup(
+    name = "js_plugin_api_srcs",
+    srcs = glob(["**/*.ts"]),
+)
+
+ts_config(
+    name = "ts_config",
+    src = "tsconfig.json",
+    deps = [
+        "//plugins:tsconfig-plugins-base.json",
+    ],
+)
+
+ts_project(
+    name = "js_plugin_api_compiled",
+    srcs = glob(["**/*.ts"]),
+    incremental = True,
+    tsc = "//tools/node_tools:tsc-bin",
+    tsconfig = ":ts_config",
+)
+
+# Use this rule for publishing the js plugin api as a package to the npm repo.
+pkg_npm(
+    name = "js_plugin_api_npm_package",
+    srcs = glob(
+        ["**/*"],
+        exclude = [
+            "BUILD",
+            "tsconfig.json",
+            "publish.sh",
+        ],
+    ),
+    deps = [":js_plugin_api_compiled"],
+)
diff --git a/polygerrit-ui/app/api/README.md b/polygerrit-ui/app/api/README.md
index 550063f..b5710bf 100644
--- a/polygerrit-ui/app/api/README.md
+++ b/polygerrit-ui/app/api/README.md
@@ -1,23 +1,25 @@
-# API
+# Gerrit TypeScript Plugin API
 
-In this folder, we declare the API of various parts of the Gerrit webclient.
-There are two primary use cases for this:
+This package contains the types for developing browser plugins for the
+Gerrit Code Review web application. General documentation for plugin
+developers can be found at
+[gerrit-review.googlesource.com](https://gerrit-review.googlesource.com/Documentation/pg-plugin-dev.html).
 
-* apps that embed our diff viewer, gr-diff
-* Gerrit plugins that need to access some part of Gerrit to extend it
+The `.ts` files only contain types, interfaces and enums, and thus the compiled
+`.js` files only contain the enums. For JavaScript plugins this package is not
+really useful or necessary, but it also serves as the source of truth for
+what plugin APIs are actually supported.
 
-Both may be built as a separate bundle, but would like to type check against
-the same types the Gerrit/gr-diff bundle uses. For this reason, this folder
-should contain only types, with the exception of enums, where having the
-value side is deemed an acceptable duplication.
+Versioning of this API matches the MAJOR and MINOR versions of the general
+Gerrit releases, but the PATCH version is independent. When you are building
+a plugin for Gerrit x.y.z, then you should use the API package x.y.n, where
+n is the highest available patch version of the API. Patch versions will only
+contain additions and fixes, minor versions may include API removals.
 
 All types in here should use the `declare` keyword to prevent bundlers from
 renaming fields, which would break communication across separately built
-bundles. Again enums are the exception, because their keys are not referenced
+bundles. enums are the exception, because their keys are not referenced
 across bundles, and values will not be renamed by bundlers as they are strings.
 
-This API is used by other apps embedding gr-diff and any breaking changes
+This API is also used by other apps embedding gr-diff and any breaking changes
 should be discussed with the Gerrit core team and properly versioned.
-
-Gerrit types should either directly use or extend these types, so that
-breaking changes to the implementation require changes to these files.
diff --git a/polygerrit-ui/app/api/package.json b/polygerrit-ui/app/api/package.json
new file mode 100644
index 0000000..8af6832
--- /dev/null
+++ b/polygerrit-ui/app/api/package.json
@@ -0,0 +1,9 @@
+{
+  "name": "@gerritcodereview/typescript-api",
+  "version": "3.4.4",
+  "description": "Gerrit Code Review - TypeScript API",
+  "homepage": "https://www.gerritcodereview.com/",
+  "browser": true,
+  "dependencies": {},
+  "license": "Apache-2.0"
+}
diff --git a/polygerrit-ui/app/api/publish.sh b/polygerrit-ui/app/api/publish.sh
new file mode 100755
index 0000000..16de4c9
--- /dev/null
+++ b/polygerrit-ui/app/api/publish.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# Should be executed from the root of the Gerrit repo:
+# polygerrit-ui/app/api/publish.sh
+#
+# Builds the npm package @gerritcodereview/typescript-api
+#
+# Adding the `--upload` argument will also publish the package.
+
+bazel_bin=$(which bazelisk 2>/dev/null)
+if [[ -z "$bazel_bin" ]]; then
+    echo "Warning: bazelisk is not installed; falling back to bazel."
+    bazel_bin=bazel
+fi
+api_path=polygerrit-ui/app/api
+
+function cleanup() {
+  echo "Cleaning up ..."
+  rm -f ${api_path}/BUILD
+}
+trap cleanup EXIT
+cp ${api_path}/BUILD_for_publishing_api_only ${api_path}/BUILD
+
+${bazel_bin} build //${api_path}:js_plugin_api_npm_package
+
+if [ "$1" == "--upload" ]; then
+  echo 'Uploading npm package @gerritcodereview/typescript-api'
+  ${bazel_bin} run //${api_path}:js_plugin_api_npm_package.publish
+fi
diff --git a/polygerrit-ui/app/api/tsconfig.json b/polygerrit-ui/app/api/tsconfig.json
new file mode 100644
index 0000000..4d8ecac
--- /dev/null
+++ b/polygerrit-ui/app/api/tsconfig.json
@@ -0,0 +1,6 @@
+{
+  "extends": "../../../plugins/tsconfig-plugins-base.json",
+  "include": [
+    "**/*",
+  ],
+}
diff --git a/polygerrit-ui/app/elements/checks/gr-checks-action.ts b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
index e8760b1..87cab46 100644
--- a/polygerrit-ui/app/elements/checks/gr-checks-action.ts
+++ b/polygerrit-ui/app/elements/checks/gr-checks-action.ts
@@ -43,20 +43,13 @@
           white-space: nowrap;
         }
         gr-button {
-          /* It is not fully understood why this is needed, but otherwise the
-             paper-tooltip may render under some iron-icons of the content
-             below. Maybe this has to do with a z-index:0 setting for
-             paper-button, such that a stacking context is created. And the high
-             z-index of the paper-tooltip will then only be interpreted within
-             that stacking context. */
-          z-index: 1;
           --padding: var(--spacing-s) var(--spacing-m);
         }
-        gr-button paper-tooltip {
+        paper-tooltip {
           text-transform: none;
           text-align: center;
           white-space: normal;
-          width: 200px;
+          max-width: 200px;
         }
       `,
     ];
@@ -71,13 +64,17 @@
         @click="${(e: Event) => this.handleClick(e)}"
       >
         ${this.action.name}
-        <paper-tooltip
-          ?hidden="${!this.action.tooltip}"
-          offset="5"
-          fit-to-visible-bounds="true"
-          >${this.action.tooltip}</paper-tooltip
-        >
       </gr-button>
+      ${this.renderTooltip()}
+    `;
+  }
+
+  private renderTooltip() {
+    if (!this.action.tooltip) return;
+    return html`
+      <paper-tooltip offset="5" fit-to-visible-bounds="true">
+        ${this.action.tooltip}
+      </paper-tooltip>
     `;
   }
 
diff --git a/polygerrit-ui/app/services/checks/checks-model.ts b/polygerrit-ui/app/services/checks/checks-model.ts
index a68de38..f5d6e35 100644
--- a/polygerrit-ui/app/services/checks/checks-model.ts
+++ b/polygerrit-ui/app/services/checks/checks-model.ts
@@ -623,7 +623,7 @@
   actions: [
     {
       name: 'Re-Run',
-      tooltip: 'More powerful run than before',
+      tooltip: 'small',
       primary: true,
       callback: () => Promise.resolve({message: 'fake "re-run" triggered'}),
     },