diff --git a/java/com/google/gerrit/acceptance/AbstractDynamicOptionsTest.java b/java/com/google/gerrit/acceptance/AbstractDynamicOptionsTest.java
new file mode 100644
index 0000000..a4ed80a
--- /dev/null
+++ b/java/com/google/gerrit/acceptance/AbstractDynamicOptionsTest.java
@@ -0,0 +1,117 @@
+// Copyright (C) 2020 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.google.gerrit.acceptance;
+
+import static com.google.gerrit.sshd.CommandMetaData.Mode.MASTER_OR_SLAVE;
+
+import com.google.common.collect.Lists;
+import com.google.gerrit.extensions.annotations.Exports;
+import com.google.gerrit.json.OutputFormat;
+import com.google.gerrit.server.DynamicOptions;
+import com.google.gerrit.sshd.CommandMetaData;
+import com.google.gerrit.sshd.CommandModule;
+import com.google.gerrit.sshd.SshCommand;
+import com.google.gson.reflect.TypeToken;
+import com.google.inject.AbstractModule;
+import com.google.inject.Inject;
+import java.io.BufferedWriter;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.util.Collections;
+import java.util.List;
+
+public class AbstractDynamicOptionsTest extends AbstractDaemonTest {
+  protected static final String LS_SAMPLES = "ls-samples";
+
+  protected interface Bean {
+    void setSamples(List<String> samples);
+  }
+
+  protected static class ListSamples implements Bean, DynamicOptions.BeanReceiver {
+    protected List<String> samples = Collections.emptyList();
+
+    @Override
+    public void setSamples(List<String> samples) {
+      this.samples = samples;
+    }
+
+    public void display(OutputStream displayOutputStream) throws Exception {
+      PrintWriter stdout =
+          new PrintWriter(new BufferedWriter(new OutputStreamWriter(displayOutputStream, "UTF-8")));
+      try {
+        OutputFormat.JSON
+            .newGson()
+            .toJson(samples, new TypeToken<List<String>>() {}.getType(), stdout);
+        stdout.print('\n');
+      } finally {
+        stdout.flush();
+      }
+    }
+
+    @Override
+    public void setDynamicBean(String plugin, DynamicOptions.DynamicBean dynamicBean) {}
+  }
+
+  @CommandMetaData(name = LS_SAMPLES, runsAt = MASTER_OR_SLAVE)
+  protected static class ListSamplesCommand extends SshCommand {
+    @Inject private ListSamples impl;
+
+    @Override
+    protected void run() throws Exception {
+      impl.display(out);
+    }
+
+    @Override
+    protected void parseCommandLine(DynamicOptions pluginOptions) throws UnloggedFailure {
+      parseCommandLine(impl, pluginOptions);
+    }
+  }
+
+  public static class PluginOneSshModule extends CommandModule {
+    @Override
+    public void configure() {
+      command(LS_SAMPLES).to(ListSamplesCommand.class);
+    }
+  }
+
+  protected static class ListSamplesOptions implements DynamicOptions.BeanParseListener {
+    @Override
+    public void onBeanParseStart(String plugin, Object bean) {
+      ((Bean) bean).setSamples(Lists.newArrayList("sample1", "sample2"));
+    }
+
+    @Override
+    public void onBeanParseEnd(String plugin, Object bean) {}
+  }
+
+  protected static class PluginTwoModule extends AbstractModule {
+    @Override
+    public void configure() {
+      bind(DynamicOptions.DynamicBean.class)
+          .annotatedWith(
+              Exports.named("com.google.gerrit.acceptance.AbstractDynamicOptionsTest.ListSamples"))
+          .to(ListSamplesOptionsClassNameProvider.class);
+    }
+  }
+
+  protected static class ListSamplesOptionsClassNameProvider
+      implements DynamicOptions.ClassNameProvider {
+    @Override
+    public String getClassName() {
+      return "com.google.gerrit.acceptance.AbstractDynamicOptionsTest$ListSamplesOptions";
+    }
+  }
+}
diff --git a/java/com/google/gerrit/httpd/restapi/ParameterParser.java b/java/com/google/gerrit/httpd/restapi/ParameterParser.java
index 95d99f0..326cab8 100644
--- a/java/com/google/gerrit/httpd/restapi/ParameterParser.java
+++ b/java/com/google/gerrit/httpd/restapi/ParameterParser.java
@@ -161,6 +161,8 @@
       HttpServletResponse res)
       throws IOException {
     CmdLineParser clp = parserFactory.create(param);
+    pluginOptions.setBean(param);
+    pluginOptions.startLifecycleListeners();
     pluginOptions.parseDynamicBeans(clp);
     pluginOptions.setDynamicBeans();
     pluginOptions.onBeanParseStart();
diff --git a/java/com/google/gerrit/httpd/restapi/RestApiServlet.java b/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
index 4d55b36..0e525ce 100644
--- a/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
+++ b/java/com/google/gerrit/httpd/restapi/RestApiServlet.java
@@ -507,7 +507,7 @@
           }
 
           try (DynamicOptions pluginOptions =
-              new DynamicOptions(viewData.view, globals.injector, globals.dynamicBeans)) {
+              new DynamicOptions(globals.injector, globals.dynamicBeans)) {
             if (!globals
                 .paramParser
                 .get()
diff --git a/java/com/google/gerrit/server/DynamicOptions.java b/java/com/google/gerrit/server/DynamicOptions.java
index 1d36ff0..db0aa70 100644
--- a/java/com/google/gerrit/server/DynamicOptions.java
+++ b/java/com/google/gerrit/server/DynamicOptions.java
@@ -193,6 +193,7 @@
   protected Object bean;
   protected Map<String, DynamicBean> beansByPlugin;
   protected Injector injector;
+  protected DynamicMap<DynamicBean> dynamicBeans;
   protected LifecycleManager lifecycleManager;
 
   /**
@@ -200,7 +201,9 @@
    * this class so the following methods can be called if desired:
    *
    * <pre>
-   *    DynamicOptions pluginOptions = new DynamicOptions(bean, injector, dynamicBeans);
+   *    DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans);
+   *    pluginOptions.setBean(bean);
+   *    pluginOptions.startLifecycleListeners();
    *    pluginOptions.parseDynamicBeans(clp);
    *    pluginOptions.setDynamicBeans();
    *    pluginOptions.onBeanParseStart();
@@ -210,11 +213,15 @@
    *    pluginOptions.onBeanParseEnd();
    * </pre>
    */
-  public DynamicOptions(Object bean, Injector injector, DynamicMap<DynamicBean> dynamicBeans) {
-    this.bean = bean;
+  public DynamicOptions(Injector injector, DynamicMap<DynamicBean> dynamicBeans) {
     this.injector = injector;
+    this.dynamicBeans = dynamicBeans;
     lifecycleManager = new LifecycleManager();
     beansByPlugin = new HashMap<>();
+  }
+
+  public void setBean(Object bean) {
+    this.bean = bean;
     Class<?> beanClass =
         (bean instanceof BeanReceiver)
             ? ((BeanReceiver) bean).getExportedBeanReceiver()
@@ -226,7 +233,6 @@
         beansByPlugin.put(plugin, getDynamicBean(bean, provider.get()));
       }
     }
-    startLifecycleListeners();
   }
 
   @SuppressWarnings("unchecked")
diff --git a/java/com/google/gerrit/server/api/changes/ChangeApiImpl.java b/java/com/google/gerrit/server/api/changes/ChangeApiImpl.java
index 0992bcd..d349dda 100644
--- a/java/com/google/gerrit/server/api/changes/ChangeApiImpl.java
+++ b/java/com/google/gerrit/server/api/changes/ChangeApiImpl.java
@@ -177,6 +177,8 @@
   private final Provider<GetPureRevert> getPureRevertProvider;
   private final StarredChangesUtil stars;
   private final DynamicOptionParser dynamicOptionParser;
+  private final Injector injector;
+  private final DynamicMap<DynamicOptions.DynamicBean> dynamicBeans;
 
   @Inject
   ChangeApiImpl(
@@ -230,7 +232,9 @@
       Provider<GetPureRevert> getPureRevertProvider,
       StarredChangesUtil stars,
       DynamicOptionParser dynamicOptionParser,
-      @Assisted ChangeResource change) {
+      @Assisted ChangeResource change,
+      Injector injector,
+      DynamicMap<DynamicOptions.DynamicBean> dynamicBeans) {
     this.changeApi = changeApi;
     this.revert = revert;
     this.revertSubmission = revertSubmission;
@@ -282,6 +286,8 @@
     this.stars = stars;
     this.dynamicOptionParser = dynamicOptionParser;
     this.change = change;
+    this.injector = injector;
+    this.dynamicBeans = dynamicBeans;
   }
 
   @Override
@@ -500,10 +506,10 @@
   public ChangeInfo get(
       EnumSet<ListChangesOption> options, ImmutableListMultimap<String, String> pluginOptions)
       throws RestApiException {
-    try {
+    try (DynamicOptions dynamicOptions = new DynamicOptions(injector, dynamicBeans)) {
       GetChange getChange = getChangeProvider.get();
       options.forEach(getChange::addOption);
-      dynamicOptionParser.parseDynamicOptions(getChange, pluginOptions);
+      dynamicOptionParser.parseDynamicOptions(getChange, pluginOptions, dynamicOptions);
       return getChange.apply(change).value();
     } catch (Exception e) {
       throw asRestApiException("Cannot retrieve change", e);
@@ -759,8 +765,6 @@
   @Singleton
   static class DynamicOptionParser {
     private final CmdLineParser.Factory cmdLineParserFactory;
-    private final Injector injector;
-    private final DynamicMap<DynamicOptions.DynamicBean> dynamicBeans;
 
     @Inject
     DynamicOptionParser(
@@ -768,14 +772,14 @@
         Injector injector,
         DynamicMap<DynamicOptions.DynamicBean> dynamicBeans) {
       this.cmdLineParserFactory = cmdLineParserFactory;
-      this.injector = injector;
-      this.dynamicBeans = dynamicBeans;
     }
 
-    void parseDynamicOptions(Object bean, ListMultimap<String, String> pluginOptions)
+    void parseDynamicOptions(
+        Object bean, ListMultimap<String, String> pluginOptions, DynamicOptions dynamicOptions)
         throws BadRequestException {
       CmdLineParser clp = cmdLineParserFactory.create(bean);
-      DynamicOptions dynamicOptions = new DynamicOptions(bean, injector, dynamicBeans);
+      dynamicOptions.setBean(bean);
+      dynamicOptions.startLifecycleListeners();
       dynamicOptions.parseDynamicBeans(clp);
       dynamicOptions.setDynamicBeans();
       dynamicOptions.onBeanParseStart();
diff --git a/java/com/google/gerrit/server/api/changes/ChangesImpl.java b/java/com/google/gerrit/server/api/changes/ChangesImpl.java
index d6ef61c..0596524 100644
--- a/java/com/google/gerrit/server/api/changes/ChangesImpl.java
+++ b/java/com/google/gerrit/server/api/changes/ChangesImpl.java
@@ -26,15 +26,18 @@
 import com.google.gerrit.extensions.client.ListChangesOption;
 import com.google.gerrit.extensions.common.ChangeInfo;
 import com.google.gerrit.extensions.common.ChangeInput;
+import com.google.gerrit.extensions.registration.DynamicMap;
 import com.google.gerrit.extensions.restapi.IdString;
 import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.extensions.restapi.TopLevelResource;
 import com.google.gerrit.extensions.restapi.Url;
+import com.google.gerrit.server.DynamicOptions;
 import com.google.gerrit.server.api.changes.ChangeApiImpl.DynamicOptionParser;
 import com.google.gerrit.server.restapi.change.ChangesCollection;
 import com.google.gerrit.server.restapi.change.CreateChange;
 import com.google.gerrit.server.restapi.change.QueryChanges;
 import com.google.inject.Inject;
+import com.google.inject.Injector;
 import com.google.inject.Provider;
 import com.google.inject.Singleton;
 import java.util.List;
@@ -46,6 +49,8 @@
   private final CreateChange createChange;
   private final DynamicOptionParser dynamicOptionParser;
   private final Provider<QueryChanges> queryProvider;
+  private final Injector injector;
+  private final DynamicMap<DynamicOptions.DynamicBean> dynamicBeans;
 
   @Inject
   ChangesImpl(
@@ -53,12 +58,16 @@
       ChangeApiImpl.Factory api,
       CreateChange createChange,
       DynamicOptionParser dynamicOptionParser,
-      Provider<QueryChanges> queryProvider) {
+      Provider<QueryChanges> queryProvider,
+      Injector injector,
+      DynamicMap<DynamicOptions.DynamicBean> dynamicBeans) {
     this.changes = changes;
     this.api = api;
     this.createChange = createChange;
     this.dynamicOptionParser = dynamicOptionParser;
     this.queryProvider = queryProvider;
+    this.injector = injector;
+    this.dynamicBeans = dynamicBeans;
   }
 
   @Override
@@ -123,34 +132,36 @@
   }
 
   private List<ChangeInfo> get(QueryRequest q) throws RestApiException {
-    QueryChanges qc = queryProvider.get();
-    if (q.getQuery() != null) {
-      qc.addQuery(q.getQuery());
-    }
-    qc.setLimit(q.getLimit());
-    qc.setStart(q.getStart());
-    qc.setNoLimit(q.getNoLimit());
-    for (ListChangesOption option : q.getOptions()) {
-      qc.addOption(option);
-    }
-    dynamicOptionParser.parseDynamicOptions(qc, q.getPluginOptions());
-
-    try {
-      List<?> result = qc.apply(TopLevelResource.INSTANCE).value();
-      if (result.isEmpty()) {
-        return ImmutableList.of();
+    try (DynamicOptions dynamicOptions = new DynamicOptions(injector, dynamicBeans)) {
+      QueryChanges qc = queryProvider.get();
+      if (q.getQuery() != null) {
+        qc.addQuery(q.getQuery());
       }
+      qc.setLimit(q.getLimit());
+      qc.setStart(q.getStart());
+      qc.setNoLimit(q.getNoLimit());
+      for (ListChangesOption option : q.getOptions()) {
+        qc.addOption(option);
+      }
+      dynamicOptionParser.parseDynamicOptions(qc, q.getPluginOptions(), dynamicOptions);
 
-      // Check type safety of result; the extension API should be safer than the
-      // REST API in this case, since it's intended to be used in Java.
-      Object first = requireNonNull(result.iterator().next());
-      checkState(first instanceof ChangeInfo);
-      @SuppressWarnings("unchecked")
-      List<ChangeInfo> infos = (List<ChangeInfo>) result;
+      try {
+        List<?> result = qc.apply(TopLevelResource.INSTANCE).value();
+        if (result.isEmpty()) {
+          return ImmutableList.of();
+        }
 
-      return ImmutableList.copyOf(infos);
-    } catch (Exception e) {
-      throw asRestApiException("Cannot query changes", e);
+        // Check type safety of result; the extension API should be safer than the
+        // REST API in this case, since it's intended to be used in Java.
+        Object first = requireNonNull(result.iterator().next());
+        checkState(first instanceof ChangeInfo);
+        @SuppressWarnings("unchecked")
+        List<ChangeInfo> infos = (List<ChangeInfo>) result;
+
+        return ImmutableList.copyOf(infos);
+      } catch (Exception e) {
+        throw asRestApiException("Cannot query changes", e);
+      }
     }
   }
 }
diff --git a/java/com/google/gerrit/server/change/DeleteReviewerOp.java b/java/com/google/gerrit/server/change/DeleteReviewerOp.java
index 07cb04f..bf00d27 100644
--- a/java/com/google/gerrit/server/change/DeleteReviewerOp.java
+++ b/java/com/google/gerrit/server/change/DeleteReviewerOp.java
@@ -40,6 +40,7 @@
 import com.google.gerrit.server.mail.send.DeleteReviewerSender;
 import com.google.gerrit.server.mail.send.MessageIdGenerator;
 import com.google.gerrit.server.notedb.ChangeUpdate;
+import com.google.gerrit.server.notedb.ReviewerStateInternal;
 import com.google.gerrit.server.permissions.PermissionBackendException;
 import com.google.gerrit.server.project.ProjectCache;
 import com.google.gerrit.server.project.RemoveReviewerControl;
@@ -132,9 +133,15 @@
     for (LabelType lt : labelTypes.getLabelTypes()) {
       newApprovals.put(lt.getName(), (short) 0);
     }
-
+    String ccOrReviewer =
+        approvalsUtil
+                .getReviewers(ctx.getNotes())
+                .byState(ReviewerStateInternal.CC)
+                .contains(reviewerId)
+            ? "cc"
+            : "reviewer";
     StringBuilder msg = new StringBuilder();
-    msg.append("Removed reviewer " + reviewer.account().fullName());
+    msg.append(String.format("Removed %s %s", ccOrReviewer, reviewer.account().fullName()));
     StringBuilder removedVotesMsg = new StringBuilder();
     removedVotesMsg.append(" with the following votes:\n\n");
     boolean votesRemoved = false;
diff --git a/java/com/google/gerrit/sshd/BaseCommand.java b/java/com/google/gerrit/sshd/BaseCommand.java
index 0dbae0a..fe03770 100644
--- a/java/com/google/gerrit/sshd/BaseCommand.java
+++ b/java/com/google/gerrit/sshd/BaseCommand.java
@@ -235,6 +235,8 @@
   protected void parseCommandLine(Object options, DynamicOptions pluginOptions)
       throws UnloggedFailure {
     final CmdLineParser clp = newCmdLineParser(options);
+    pluginOptions.setBean(options);
+    pluginOptions.startLifecycleListeners();
     pluginOptions.parseDynamicBeans(clp);
     pluginOptions.setDynamicBeans();
     pluginOptions.onBeanParseStart();
@@ -468,8 +470,7 @@
 
           try {
             if (thunk instanceof ProjectCommandRunnable) {
-              try (DynamicOptions pluginOptions =
-                  new DynamicOptions(BaseCommand.this, injector, dynamicBeans)) {
+              try (DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans)) {
                 ((ProjectCommandRunnable) thunk).executeParseCommand(pluginOptions);
                 projectName = ((ProjectCommandRunnable) thunk).getProjectName();
                 thunk.run();
diff --git a/java/com/google/gerrit/sshd/DispatchCommand.java b/java/com/google/gerrit/sshd/DispatchCommand.java
index a45cd31..54171a3 100644
--- a/java/com/google/gerrit/sshd/DispatchCommand.java
+++ b/java/com/google/gerrit/sshd/DispatchCommand.java
@@ -72,8 +72,7 @@
 
   @Override
   public void start(ChannelSession channel, Environment env) throws IOException {
-    try (DynamicOptions pluginOptions =
-        new DynamicOptions(DispatchCommand.this, injector, dynamicBeans)) {
+    try (DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans)) {
       parseCommandLine(pluginOptions);
       if (Strings.isNullOrEmpty(commandName)) {
         StringWriter msg = new StringWriter();
diff --git a/java/com/google/gerrit/sshd/SshCommand.java b/java/com/google/gerrit/sshd/SshCommand.java
index 3ef7061..c94b25c 100644
--- a/java/com/google/gerrit/sshd/SshCommand.java
+++ b/java/com/google/gerrit/sshd/SshCommand.java
@@ -50,8 +50,7 @@
   public void start(ChannelSession channel, Environment env) throws IOException {
     startThread(
         () -> {
-          try (DynamicOptions pluginOptions =
-              new DynamicOptions(SshCommand.this, injector, dynamicBeans)) {
+          try (DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans)) {
             parseCommandLine(pluginOptions);
             stdout = toPrintWriter(out);
             stderr = toPrintWriter(err);
diff --git a/java/com/google/gerrit/sshd/SuExec.java b/java/com/google/gerrit/sshd/SuExec.java
index bf785bb..3c6e8c2 100644
--- a/java/com/google/gerrit/sshd/SuExec.java
+++ b/java/com/google/gerrit/sshd/SuExec.java
@@ -93,7 +93,7 @@
 
   @Override
   public void start(ChannelSession channel, Environment env) throws IOException {
-    try (DynamicOptions pluginOptions = new DynamicOptions(SuExec.this, injector, dynamicBeans)) {
+    try (DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans)) {
       checkCanRunAs();
       parseCommandLine(pluginOptions);
 
diff --git a/java/com/google/gerrit/sshd/commands/StreamEvents.java b/java/com/google/gerrit/sshd/commands/StreamEvents.java
index 188cc83..c47d24c 100644
--- a/java/com/google/gerrit/sshd/commands/StreamEvents.java
+++ b/java/com/google/gerrit/sshd/commands/StreamEvents.java
@@ -108,8 +108,7 @@
 
   @Override
   public void start(ChannelSession channel, Environment env) throws IOException {
-    try (DynamicOptions pluginOptions =
-        new DynamicOptions(StreamEvents.this, injector, dynamicBeans)) {
+    try (DynamicOptions pluginOptions = new DynamicOptions(injector, dynamicBeans)) {
       try {
         parseCommandLine(pluginOptions);
       } catch (UnloggedFailure e) {
diff --git a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
index f59fba0..b7f1ef0 100644
--- a/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
+++ b/javatests/com/google/gerrit/acceptance/api/change/ChangeIT.java
@@ -2258,6 +2258,10 @@
     assertThat(message.body()).contains("Removed reviewer " + user.fullName() + ".");
     assertThat(message.body()).doesNotContain("with the following votes");
 
+    // Make sure the change message for removing a reviewer is correct.
+    assertThat(Iterables.getLast(gApi.changes().id(changeId).messages()).message)
+        .contains("Removed reviewer " + user.fullName());
+
     // Make sure the reviewer can still be added again.
     gApi.changes().id(changeId).addReviewer(user.id().toString());
     c = gApi.changes().id(changeId).get();
@@ -2273,6 +2277,31 @@
   }
 
   @Test
+  public void removeCC() throws Exception {
+    PushOneCommit.Result result = createChange();
+    String changeId = result.getChangeId();
+    // Add a cc
+    AddReviewerInput addReviewerInput = new AddReviewerInput();
+    addReviewerInput.state = CC;
+    addReviewerInput.reviewer = user.id().toString();
+    gApi.changes().id(changeId).addReviewer(addReviewerInput);
+
+    // Remove a cc
+    sender.clear();
+    gApi.changes().id(changeId).reviewer(user.id().toString()).remove();
+    assertThat(gApi.changes().id(changeId).get().reviewers).isEmpty();
+
+    // Make sure the email for removing a cc is correct.
+    assertThat(sender.getMessages()).hasSize(1);
+    Message message = sender.getMessages().get(0);
+    assertThat(message.body()).contains("Removed cc " + user.fullName() + ".");
+
+    // Make sure the change message for removing a reviewer is correct.
+    assertThat(Iterables.getLast(gApi.changes().id(changeId).messages()).message)
+        .contains("Removed cc " + user.fullName());
+  }
+
+  @Test
   public void removeReviewer() throws Exception {
     testRemoveReviewer(true);
   }
diff --git a/javatests/com/google/gerrit/acceptance/ssh/DynamicOptionsIT.java b/javatests/com/google/gerrit/acceptance/ssh/DynamicOptionsIT.java
new file mode 100644
index 0000000..c0f2b36
--- /dev/null
+++ b/javatests/com/google/gerrit/acceptance/ssh/DynamicOptionsIT.java
@@ -0,0 +1,52 @@
+// Copyright (C) 2020 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.google.gerrit.acceptance.ssh;
+
+import static com.google.gerrit.server.query.change.OutputStreamQuery.GSON;
+import static junit.framework.TestCase.assertEquals;
+
+import com.google.common.collect.Lists;
+import com.google.gerrit.acceptance.AbstractDynamicOptionsTest;
+import com.google.gerrit.acceptance.NoHttpd;
+import com.google.gerrit.acceptance.UseSsh;
+import com.google.gson.reflect.TypeToken;
+import com.google.inject.Module;
+import java.io.IOException;
+import java.util.List;
+import org.junit.Test;
+
+@NoHttpd
+@UseSsh
+public class DynamicOptionsIT extends AbstractDynamicOptionsTest {
+
+  @Override
+  public Module createSshModule() {
+    return new AbstractDynamicOptionsTest.PluginOneSshModule();
+  }
+
+  @Test
+  public void testDynamicPluginOptions() throws Exception {
+    try (AutoCloseable ignored =
+        installPlugin("my-plugin", AbstractDynamicOptionsTest.PluginTwoModule.class)) {
+      List<String> samples = getSamplesList(adminSshSession.exec("ls-samples"));
+      adminSshSession.assertSuccess();
+      assertEquals(Lists.newArrayList("sample1", "sample2"), samples);
+    }
+  }
+
+  protected List<String> getSamplesList(String sshOutput) throws IOException {
+    return GSON.fromJson(sshOutput, new TypeToken<List<String>>() {}.getType());
+  }
+}
diff --git a/plugins/download-commands b/plugins/download-commands
index cfa03bc..5bd359c 160000
--- a/plugins/download-commands
+++ b/plugins/download-commands
@@ -1 +1 @@
-Subproject commit cfa03bc5e7a7e1e27b83f2dba60e9a9eb7c8f4aa
+Subproject commit 5bd359c08e10b93d2c08762f75cde01a14e45fc6
diff --git a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
index 51ce9b4..20fbc32 100644
--- a/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-actions/gr-change-actions.ts
@@ -42,6 +42,7 @@
 import {
   fetchChangeUpdates,
   patchNumEquals,
+  CURRENT,
 } from '../../../utils/patch-set-util';
 import {
   changeIsOpen,
@@ -1591,7 +1592,7 @@
     if (!labels) {
       return Promise.resolve(undefined);
     }
-    return this.$.restAPI.saveChangeReview(newChangeId, 'current', {labels});
+    return this.$.restAPI.saveChangeReview(newChangeId, CURRENT, {labels});
   }
 
   _handleResponse(action: UIActionInfo, response?: Response) {
diff --git a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
index 4f3d7ce6..e4e4056 100644
--- a/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
+++ b/polygerrit-ui/app/elements/core/gr-error-manager/gr-error-manager.ts
@@ -336,7 +336,7 @@
     const el = this._createToastAlert();
     el.show(text, actionText, actionCallback);
     this._alertElement = el;
-    this.fire('iron-announce', {text}, {bubbles: true});
+    this.fire('iron-announce', {text: `Alert: ${text}`}, {bubbles: true});
     this.reporting.reportInteraction('show-alert', {text});
   }
 
diff --git a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
index 683d887..ef5be9fd 100644
--- a/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
+++ b/polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api.ts
@@ -23,6 +23,7 @@
   getParentIndex,
   isMergeParent,
   patchNumEquals,
+  CURRENT,
 } from '../../../utils/patch-set-util';
 import {customElement, property} from '@polymer/decorators';
 import {
@@ -612,7 +613,7 @@
   }
 
   getPortedComments(changeNum: NumericChangeId, revision?: RevisionId) {
-    if (!revision) revision = 'current';
+    if (!revision) revision = CURRENT;
     return Promise.all([
       this.$.restAPI.getPortedComments(changeNum, revision),
       this.$.restAPI.getPortedDrafts(changeNum, revision),
diff --git a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
index bb0ed61..5a6113c 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
+++ b/polygerrit-ui/app/elements/diff/gr-diff-view/gr-diff-view.ts
@@ -48,6 +48,7 @@
   computeLatestPatchNum,
   patchNumEquals,
   PatchSet,
+  CURRENT,
 } from '../../../utils/patch-set-util';
 import {
   addUnmodifiedFiles,
@@ -1047,7 +1048,7 @@
 
     const portedCommentsPromise = this.$.commentAPI.getPortedComments(
       value.changeNum,
-      value.patchNum || 'current'
+      value.patchNum || CURRENT
     );
 
     const promises: Promise<unknown>[] = [];
diff --git a/polygerrit-ui/app/elements/gr-app-element.ts b/polygerrit-ui/app/elements/gr-app-element.ts
index 2915acd..617034b 100644
--- a/polygerrit-ui/app/elements/gr-app-element.ts
+++ b/polygerrit-ui/app/elements/gr-app-element.ts
@@ -492,6 +492,9 @@
         registrationOverlay.refit();
       });
     }
+    // To fix bug announce read after each new view, we reset announce with
+    // empty space
+    this.fire('iron-announce', {text: ' '}, {bubbles: true});
   }
 
   _handleShortcutTriggered(event: ShortcutTriggeredEvent) {
diff --git a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
index da2881e..0b4e577 100644
--- a/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
+++ b/polygerrit-ui/app/elements/shared/gr-hovercard-account/gr-hovercard-account.ts
@@ -46,6 +46,7 @@
 } from '../../../utils/attention-set-util';
 import {ReviewerState} from '../../../constants/constants';
 import {isRemovableReviewer} from '../../../utils/change-util';
+import {CURRENT} from '../../../utils/patch-set-util';
 
 export interface GrHovercardAccount {
   $: {
@@ -186,7 +187,7 @@
     ];
 
     this.$.restAPI
-      .saveChangeReview(this.change._number, 'current', reviewInput)
+      .saveChangeReview(this.change._number, CURRENT, reviewInput)
       .then(response => {
         if (!response || !response.ok) {
           throw new Error(
diff --git a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
index d75c186..b86fcff 100644
--- a/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
+++ b/polygerrit-ui/app/elements/shared/gr-rest-api-interface/gr-rest-api-interface_test.js
@@ -22,6 +22,7 @@
 import {ListChangesOption} from '../../../utils/change-util.js';
 import {appContext} from '../../../services/app-context.js';
 import {createChange} from '../../../test/test-data-generators.js';
+import {CURRENT} from '../../../utils/patch-set-util.js';
 
 const basicFixture = fixtureFromElement('gr-rest-api-interface');
 
@@ -1350,7 +1351,7 @@
     sinon.stub(element._restApiHelper, 'fetchJSON').returns(Promise.resolve({
       ok: false}));
 
-    element.getPortedComments(change._number, 'current');
+    element.getPortedComments(change._number, CURRENT);
 
     assert.isFalse(dispatchStub.called);
   });
@@ -1361,7 +1362,7 @@
     const getChangeURLAndFetchStub = sinon.stub(element,
         '_getChangeURLAndFetch');
 
-    element.getPortedDrafts(change._number, 'current');
+    element.getPortedDrafts(change._number, CURRENT);
 
     assert.isFalse(getChangeURLAndFetchStub.called);
   });
diff --git a/polygerrit-ui/app/utils/patch-set-util.ts b/polygerrit-ui/app/utils/patch-set-util.ts
index 8974af8..d063168 100644
--- a/polygerrit-ui/app/utils/patch-set-util.ts
+++ b/polygerrit-ui/app/utils/patch-set-util.ts
@@ -45,6 +45,8 @@
   PARENT: 'PARENT',
 };
 
+export const CURRENT = 'current';
+
 export interface PatchSet {
   num: PatchSetNum;
   desc: string | undefined;