KAFKA-15483: Add KIP-938 and KIP-866 metrics to bundled docs (apache#…

…14421)

Reviewers: Divij Vaidya <[email protected]>, Ron Dagostino <[email protected]>

docs/ops.html

@@ -1980,6 +1980,28 @@ <h5 class="anchor-heading"><a id="kraft_quorum_monitoring" class="anchor-link"><
     <td>The average fraction of time the client's poll() is idle as opposed to waiting for the user code to process records.</td>
     <td>kafka.server:type=raft-metrics,name=poll-idle-ratio-avg</td>
   </tr>
+  <tr>
+    <td>Current Metadata Version</td>
+    <td>Outputs the feature level of the current effective metadata version.</td>
+    <td>kafka.server:type=MetadataLoader,name=CurrentMetadataVersion</td>
+  </tr>
+  <tr>
+    <td>Metadata Snapshot Load Count</td>
+    <td>The total number of times we have loaded a KRaft snapshot since the process was started.</td>
+    <td>kafka.server:type=MetadataLoader,name=HandleLoadSnapshotCount</td>
+  </tr>
+  <tr>
+    <td>Latest Metadata Snapshot Size</td>
+    <td>The total size in bytes of the latest snapshot that the node has generated. If none have been generated yet, this is the size
+    of the latest snapshot that was loaded. If no snapshots have been generated or loaded, this is 0.</td>
+    <td>kafka.server:type=SnapshotEmitter,name=LatestSnapshotGeneratedBytes</td>
+  </tr>
+  <tr>
+    <td>Latest Metadata Snapshot Age</td>
+    <td>The interval in milliseconds since the latest snapshot that the node has generated. 
+    If none have been generated yet, this is approximately the time delta since the process was started.</td>
+    <td>kafka.server:type=SnapshotEmitter,name=LatestSnapshotGeneratedAgeMs</td>
+  </tr>
   </tbody>
 </table>
 <h5 class="anchor-heading"><a id="kraft_controller_monitoring" class="anchor-link"></a><a href="#kraft_controller_monitoring">KRaft Controller Monitoring Metrics</a></h5>
@@ -2061,6 +2083,44 @@ <h5 class="anchor-heading"><a id="kraft_controller_monitoring" class="anchor-lin
     For active Controllers the value of this lag is always zero.</td>
     <td>kafka.controller:type=KafkaController,name=LastAppliedRecordLagMs</td>
   </tr>
+  <tr>
+    <td>ZooKeeper Write Behind Lag</td>
+    <td>The amount of lag in records that ZooKeeper is behind relative to the highest committed record in the metadata log. 
+    This metric will only be reported by the active KRaft controller.</td>
+    <td>kafka.controller:type=KafkaController,name=ZkWriteBehindLag</td>
+  </tr>
+  <tr>
+    <td>ZooKeeper Metadata Snapshot Write Time</td>
+    <td>The number of milliseconds the KRaft controller took reconciling a snapshot into ZooKeeper.</td>
+    <td>kafka.controller:type=KafkaController,name=ZkWriteSnapshotTimeMs</td>
+  </tr>
+  <tr>
+    <td>ZooKeeper Metadata Delta Write Time</td>
+    <td>The number of milliseconds the KRaft controller took writing a delta into ZK.</td>
+    <td>kafka.controller:type=KafkaController,name=ZkWriteDeltaTimeMs</td>
+  </tr>
+  <tr>
+    <td>Timed-out Broker Heartbeat Count</td>
+    <td>The number of broker heartbeats that timed out on this controller since the process was started. Note that only 
+    active controllers handle heartbeats, so only they will see increases in this metric.</td>
+    <td>kafka.controller:type=KafkaController,name=TimedOutBrokerHeartbeatCount</td>
+  </tr>
+  <tr>
+    <td>Number Of Operations Started In Event Queue</td>
+    <td>The total number of controller event queue operations that were started. This includes deferred operations.</td>
+    <td>kafka.controller:type=KafkaController,name=EventQueueOperationsStartedCount</td>
+  </tr>
+  <tr>
+    <td>Number of Operations Timed Out In Event Queue</td>
+    <td>The total number of controller event queue operations that timed out before they could be performed.</td>
+    <td>kafka.controller:type=KafkaController,name=EventQueueOperationsTimedOutCount</td>
+  </tr>
+  <tr>
+    <td>Number Of New Controller Elections</td>
+    <td>Counts the number of times this node has seen a new controller elected. A transition to the "no leader" state 
+    is not counted here. If the same controller as before becomes active, that still counts.</td>
+    <td>kafka.controller:type=KafkaController,name=NewActiveControllersCount</td>
+  </tr>
   </tbody>
 </table>
   <h5 class="anchor-heading"><a id="kraft_broker_monitoring" class="anchor-link"></a><a href="#kraft_broker_monitoring">KRaft Broker Monitoring Metrics</a></h5>