diff --git a/Documentation/linux-quickstart.txt b/Documentation/linux-quickstart.txt
index 29bb409..e34071f 100644
--- a/Documentation/linux-quickstart.txt
+++ b/Documentation/linux-quickstart.txt
@@ -19,8 +19,7 @@
 
 . A Unix-based server, including any Linux flavor, MacOS, or Berkeley Software
     Distribution (BSD).
-. Java SE Runtime Environment version 1.8. Gerrit is not compatible with Java
-    9 or newer yet.
+. Java SE Runtime Environment version 11 and up.
 
 == Download Gerrit
 
diff --git a/java/com/google/gerrit/server/notedb/ChangeNotesCommit.java b/java/com/google/gerrit/server/notedb/ChangeNotesCommit.java
index 71cb8c9..76573f6 100644
--- a/java/com/google/gerrit/server/notedb/ChangeNotesCommit.java
+++ b/java/com/google/gerrit/server/notedb/ChangeNotesCommit.java
@@ -15,9 +15,12 @@
 package com.google.gerrit.server.notedb;
 
 import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_ATTENTION;
+import static com.google.gerrit.server.notedb.ChangeNoteUtil.FOOTER_PATCH_SET;
 
 import com.google.common.collect.ListMultimap;
 import com.google.common.collect.MultimapBuilder;
+import com.google.common.collect.Sets;
 import com.google.gerrit.server.git.InMemoryInserter;
 import com.google.gerrit.server.git.InsertedObject;
 import java.io.IOException;
@@ -127,4 +130,14 @@
     }
     return footerLines.get(key.getName().toLowerCase());
   }
+
+  public boolean isAttentionSetCommitOnly(boolean hasChangeMessage) {
+    return !hasChangeMessage
+        && footerLines
+            .keySet()
+            .equals(
+                Sets.newHashSet(
+                    FOOTER_PATCH_SET.getName().toLowerCase(),
+                    FOOTER_ATTENTION.getName().toLowerCase()));
+  }
 }
diff --git a/java/com/google/gerrit/server/notedb/ChangeNotesParser.java b/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
index f4d6cd3..f12176b 100644
--- a/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
+++ b/java/com/google/gerrit/server/notedb/ChangeNotesParser.java
@@ -327,7 +327,6 @@
   }
 
   private void parse(ChangeNotesCommit commit) throws ConfigInvalidException {
-    updateCount++;
     Timestamp commitTimestamp = getCommitTimestamp(commit);
 
     createdOn = commitTimestamp;
@@ -370,7 +369,8 @@
       originalSubject = currSubject;
     }
 
-    parseChangeMessage(psId, accountId, realAccountId, commit, commitTimestamp);
+    boolean hasChangeMessage =
+        parseChangeMessage(psId, accountId, realAccountId, commit, commitTimestamp);
     if (topic == null) {
       topic = parseTopic(commit);
     }
@@ -435,6 +435,9 @@
 
     previousWorkInProgressFooter = null;
     parseWorkInProgress(commit);
+    if (countTowardsMaxUpdatesLimit(commit, hasChangeMessage)) {
+      updateCount++;
+    }
   }
 
   private void parseSubmission(ChangeNotesCommit commit, Timestamp commitTimestamp)
@@ -720,7 +723,7 @@
     }
   }
 
-  private void parseChangeMessage(
+  private boolean parseChangeMessage(
       PatchSet.Id psId,
       Account.Id accountId,
       Account.Id realAccountId,
@@ -728,7 +731,7 @@
       Timestamp ts) {
     Optional<String> changeMsgString = getChangeMessageString(commit);
     if (!changeMsgString.isPresent()) {
-      return;
+      return false;
     }
 
     ChangeMessage changeMessage =
@@ -740,7 +743,7 @@
             changeMsgString.get(),
             realAccountId,
             tag);
-    allChangeMessages.add(changeMessage);
+    return allChangeMessages.add(changeMessage);
   }
 
   public static Optional<String> getChangeMessageString(ChangeNotesCommit commit) {
@@ -1197,4 +1200,9 @@
         .orElseThrow(
             () -> parseException("cannot retrieve account id: %s", ident.getEmailAddress()));
   }
+
+  protected boolean countTowardsMaxUpdatesLimit(
+      ChangeNotesCommit commit, boolean hasChangeMessage) {
+    return !commit.isAttentionSetCommitOnly(hasChangeMessage);
+  }
 }
diff --git a/javatests/com/google/gerrit/server/notedb/ChangeNotesCommitTest.java b/javatests/com/google/gerrit/server/notedb/ChangeNotesCommitTest.java
new file mode 100644
index 0000000..f105cf1
--- /dev/null
+++ b/javatests/com/google/gerrit/server/notedb/ChangeNotesCommitTest.java
@@ -0,0 +1,124 @@
+// Copyright (C) 2021 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.server.notedb;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.server.util.time.TimeUtil;
+import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
+import org.eclipse.jgit.junit.TestRepository;
+import org.eclipse.jgit.lib.CommitBuilder;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.ObjectInserter;
+import org.eclipse.jgit.lib.PersonIdent;
+import org.eclipse.jgit.revwalk.RevCommit;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class ChangeNotesCommitTest extends AbstractChangeNotesTest {
+  private TestRepository<InMemoryRepository> testRepo;
+  private ChangeNotesCommit.ChangeNotesRevWalk walk;
+
+  @Before
+  public void setUpTestRepo() throws Exception {
+    testRepo = new TestRepository<>(repo);
+    walk = ChangeNotesCommit.newRevWalk(repo);
+  }
+
+  @After
+  public void tearDownTestRepo() throws Exception {
+    walk.close();
+  }
+
+  @Test
+  public void attentionSetCommitOnlyWhenNoChangeMessageIsPresentAndCorrectFooter()
+      throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}");
+
+    newParser(commit).parseAll();
+    assertThat(((ChangeNotesCommit) commit).isAttentionSetCommitOnly(false)).isEqualTo(true);
+  }
+
+  @Test
+  public void noAttentionSetCommitOnlyWhenNoChangeMessageIsPresentAndFooterNotOnlyAS()
+      throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Subject: Change subject\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}");
+
+    newParser(commit).parseAll();
+    assertThat(((ChangeNotesCommit) commit).isAttentionSetCommitOnly(false)).isEqualTo(false);
+  }
+
+  @Test
+  public void noAttentionSetCommitOnlyWhenNoChangeMessageIsPresentAndGenericFooter()
+      throws Exception {
+    RevCommit commit = writeCommit("Update patch set 1\n" + "\n" + "Patch-set: 1\n");
+
+    newParser(commit).parseAll();
+    assertThat(((ChangeNotesCommit) commit).isAttentionSetCommitOnly(false)).isEqualTo(false);
+  }
+
+  @Test
+  public void noAttentionSetCommitOnlyWhenChangeMessageIsPresent() throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}");
+
+    newParser(commit).parseAll();
+    assertThat(((ChangeNotesCommit) commit).isAttentionSetCommitOnly(true)).isEqualTo(false);
+  }
+
+  private ChangeNotesParser newParser(ObjectId tip) throws Exception {
+    walk.reset();
+    ChangeNoteJson changeNoteJson = injector.getInstance(ChangeNoteJson.class);
+    return new ChangeNotesParser(newChange().getId(), tip, walk, changeNoteJson, args.metrics);
+  }
+
+  private RevCommit writeCommit(String body) throws Exception {
+    Change change = newChange(true);
+    ChangeNotes notes = newNotes(change).load();
+    ChangeNoteUtil noteUtil = injector.getInstance(ChangeNoteUtil.class);
+    PersonIdent author =
+        noteUtil.newAccountIdIdent(changeOwner.getAccount().id(), TimeUtil.nowTs(), serverIdent);
+    try (ObjectInserter ins = testRepo.getRepository().newObjectInserter()) {
+      CommitBuilder cb = new CommitBuilder();
+      cb.setParentId(notes.getRevision());
+      cb.setAuthor(author);
+      cb.setCommitter(new PersonIdent(serverIdent, author.getWhen()));
+      cb.setTreeId(testRepo.tree());
+      cb.setMessage(body);
+      ObjectId id = ins.insert(cb);
+      ins.flush();
+      RevCommit commit = walk.parseCommit(id);
+      walk.parseBody(commit);
+      return commit;
+    }
+  }
+}
diff --git a/javatests/com/google/gerrit/server/notedb/ChangeNotesParserTest.java b/javatests/com/google/gerrit/server/notedb/ChangeNotesParserTest.java
index 5bfe97c..6a32fa1 100644
--- a/javatests/com/google/gerrit/server/notedb/ChangeNotesParserTest.java
+++ b/javatests/com/google/gerrit/server/notedb/ChangeNotesParserTest.java
@@ -497,6 +497,73 @@
   }
 
   @Test
+  public void attentionSetOnlyShouldNotCountTowardsMaxUpdatesLimit() throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}",
+            false);
+    ChangeNotesParser changeNotesParser = newParser(commit);
+    changeNotesParser.parseAll();
+    final boolean hasChangeMessage = false;
+    assertThat(
+            changeNotesParser.countTowardsMaxUpdatesLimit(
+                (ChangeNotesCommit) commit, hasChangeMessage))
+        .isEqualTo(false);
+  }
+
+  @Test
+  public void attentionSetWithExtraFooterShouldCountTowardsMaxUpdatesLimit() throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Subject: Change subject\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}",
+            false);
+    ChangeNotesParser changeNotesParser = newParser(commit);
+    changeNotesParser.parseAll();
+    final boolean hasChangeMessage = false;
+    assertThat(
+            changeNotesParser.countTowardsMaxUpdatesLimit(
+                (ChangeNotesCommit) commit, hasChangeMessage))
+        .isEqualTo(true);
+  }
+
+  @Test
+  public void changeWithoutAttentionSetShouldCountTowardsMaxUpdatesLimit() throws Exception {
+    RevCommit commit = writeCommit("Update WIP change\n" + "\n" + "Patch-set: 1\n", true);
+    ChangeNotesParser changeNotesParser = newParser(commit);
+    changeNotesParser.parseAll();
+    final boolean hasChangeMessage = false;
+    assertThat(
+            changeNotesParser.countTowardsMaxUpdatesLimit(
+                (ChangeNotesCommit) commit, hasChangeMessage))
+        .isEqualTo(true);
+  }
+
+  @Test
+  public void attentionSetWithCommentShouldCountTowardsMaxUpdatesLimit() throws Exception {
+    RevCommit commit =
+        writeCommit(
+            "Update patch set 1\n"
+                + "\n"
+                + "Patch-set: 1\n"
+                + "Attention: {\"person_ident\":\"Gerrit User 1000000 \\u003c1000000@adce0b11-8f2e-4ab6-ac69-e675f183d871\\u003e\",\"operation\":\"ADD\",\"reason\":\"Added by Administrator using the hovercard menu\"}",
+            false);
+    ChangeNotesParser changeNotesParser = newParser(commit);
+    changeNotesParser.parseAll();
+    final boolean hasChangeMessage = true;
+    assertThat(
+            changeNotesParser.countTowardsMaxUpdatesLimit(
+                (ChangeNotesCommit) commit, hasChangeMessage))
+        .isEqualTo(true);
+  }
+
+  @Test
   public void caseInsensitiveFooters() throws Exception {
     assertParseSucceeds(
         "Update change\n"
diff --git a/javatests/com/google/gerrit/server/notedb/OpenRepoTest.java b/javatests/com/google/gerrit/server/notedb/OpenRepoTest.java
new file mode 100644
index 0000000..e4c2196
--- /dev/null
+++ b/javatests/com/google/gerrit/server/notedb/OpenRepoTest.java
@@ -0,0 +1,143 @@
+// Copyright (C) 2021 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.server.notedb;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.testing.GerritJUnit.assertThrows;
+
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ListMultimap;
+import com.google.gerrit.entities.AttentionSetUpdate;
+import com.google.gerrit.entities.Change;
+import com.google.gerrit.server.update.ChainedReceiveCommands;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.transport.ReceiveCommand;
+import org.junit.Test;
+
+public class OpenRepoTest extends AbstractChangeNotesTest {
+
+  private final Optional<Integer> NO_UPDATES_AT_ALL = Optional.of(0);
+  private final Optional<Integer> ONLY_ONE_UPDATE = Optional.of(1);
+  private final Optional<Integer> ONLY_TWO_UPDATES = Optional.of(2);
+  private final Optional<Integer> MAX_PATCH_SETS = Optional.empty();
+
+  private FakeChainedReceiveCommands fakeChainedReceiveCommands;
+
+  @Override
+  public void setUpTestEnvironment() throws Exception {
+    super.setUpTestEnvironment();
+    fakeChainedReceiveCommands = new FakeChainedReceiveCommands(repo);
+  }
+
+  @Test
+  public void throwExceptionWhenExceedingMaxUpdatesLimit() throws Exception {
+    try (OpenRepo openRepo = openRepo()) {
+      Change c = newChange();
+      ChangeUpdate update = newUpdate(c, changeOwner);
+      update.setStatus(Change.Status.NEW);
+
+      ListMultimap<String, ChangeUpdate> changeUpdates =
+          new ImmutableListMultimap.Builder<String, ChangeUpdate>().put("one", update).build();
+
+      assertThrows(
+          LimitExceededException.class,
+          () -> openRepo.addUpdates(changeUpdates, NO_UPDATES_AT_ALL, MAX_PATCH_SETS));
+    }
+  }
+
+  @Test
+  public void allowExceedingLimitWhenAttentionSetUpdateOnly() throws Exception {
+    try (OpenRepo openRepo = openRepo()) {
+      Change c = newChange();
+      ChangeUpdate update = newUpdate(c, changeOwner);
+      update.setStatus(Change.Status.NEW);
+
+      // Add to attention set
+      AttentionSetUpdate attentionSetUpdate =
+          AttentionSetUpdate.createForWrite(
+              otherUser.getAccountId(), AttentionSetUpdate.Operation.ADD, "test");
+      update.addToPlannedAttentionSetUpdates(ImmutableSet.of(attentionSetUpdate));
+
+      ListMultimap<String, ChangeUpdate> changeUpdates =
+          new ImmutableListMultimap.Builder<String, ChangeUpdate>().put("one", update).build();
+
+      openRepo.addUpdates(changeUpdates, NO_UPDATES_AT_ALL, MAX_PATCH_SETS);
+
+      assertThat(fakeChainedReceiveCommands.commands.size()).isEqualTo(1);
+    }
+  }
+
+  @Test
+  public void attentionSetUpdateShouldNotContributeToOperationsCount() throws Exception {
+    try (OpenRepo openRepo = openRepo()) {
+      Change c1 = newChange();
+
+      ChangeUpdate update1 = newUpdateForNewChange(c1, changeOwner);
+      // Add to attention set
+      AttentionSetUpdate attentionSetUpdate =
+          AttentionSetUpdate.createForWrite(
+              otherUser.getAccountId(), AttentionSetUpdate.Operation.ADD, "test");
+      update1.addToPlannedAttentionSetUpdates(ImmutableSet.of(attentionSetUpdate));
+
+      ChangeUpdate update2 = newUpdateForNewChange(c1, changeOwner);
+      update2.setStatus(Change.Status.NEW);
+
+      ListMultimap<String, ChangeUpdate> changeUpdates =
+          new ImmutableListMultimap.Builder<String, ChangeUpdate>().put("two", update2).build();
+
+      openRepo.addUpdates(changeUpdates, ONLY_TWO_UPDATES, MAX_PATCH_SETS);
+
+      assertThat(fakeChainedReceiveCommands.commands.size()).isEqualTo(1);
+    }
+  }
+
+  @Test
+  public void normalChangeShouldContributeToOperationsCount() throws Exception {
+    try (OpenRepo openRepo = openRepo()) {
+      Change c1 = newChange();
+
+      ChangeUpdate update2 = newUpdateForNewChange(c1, changeOwner);
+      update2.setStatus(Change.Status.NEW);
+
+      ListMultimap<String, ChangeUpdate> changeUpdates =
+          new ImmutableListMultimap.Builder<String, ChangeUpdate>().put("two", update2).build();
+
+      assertThrows(
+          LimitExceededException.class,
+          () -> openRepo.addUpdates(changeUpdates, ONLY_ONE_UPDATE, MAX_PATCH_SETS));
+    }
+  }
+
+  private static class FakeChainedReceiveCommands extends ChainedReceiveCommands {
+    Map<String, ReceiveCommand> commands = new HashMap<>();
+
+    public FakeChainedReceiveCommands(Repository repo) {
+      super(repo);
+    }
+
+    @Override
+    public void add(ReceiveCommand cmd) {
+      commands.put(cmd.getRefName(), cmd);
+    }
+  }
+
+  private OpenRepo openRepo() {
+    return new OpenRepo(repo, rw, null, fakeChainedReceiveCommands, false);
+  }
+}
diff --git a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.js b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.js
index c8e058e..4864af5 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.js
+++ b/polygerrit-ui/app/elements/admin/gr-repo-list/gr-repo-list_test.js
@@ -23,20 +23,22 @@
 
 const basicFixture = fixtureFromElement('gr-repo-list');
 
-let counter;
-const repoGenerator = () => {
+function createRepo(name, counter) {
   return {
-    id: `test${++counter}`,
-    name: `test`,
+    id: `${name}${counter}`,
+    name: `${name}`,
     state: 'ACTIVE',
     web_links: [
       {
         name: 'diffusion',
-        url: `https://phabricator.example.org/r/project/test${counter}`,
+        url: `https://phabricator.example.org/r/project/${name}${counter}`,
       },
     ],
   };
-};
+}
+
+let counter;
+const repoGenerator = () => createRepo('test', ++counter);
 
 suite('gr-repo-list tests', () => {
   let element;
@@ -123,6 +125,15 @@
         done();
       });
     });
+
+    test('filter is case insensitive', async () => {
+      const repoStub = stubRestApi('getRepos');
+      const repos = [createRepo('aSDf', 0)];
+      repoStub.withArgs('asdf').returns(Promise.resolve(repos));
+      element._filter = 'asdf';
+      await element._getRepos('asdf', 25, 0);
+      assert.equal(element._repos.length, 1);
+    });
   });
 
   suite('loading', () => {