dragosvictor commented on code in PR #880:
URL: https://github.com/apache/pulsar-site/pull/880#discussion_r1576580042
##########
docs/reference-metrics-opentelemetry.md:
##########
@@ -8,6 +8,153 @@ Pulsar exposes the following OpenTelemetry metrics.
## Broker
+### Topic Messaging metrics
+
+#### pulsar.broker.topic.subscription.count
+The number of Pulsar subscriptions of the topic served by this broker.
+* Type: UpDownCounter
+* Unit: `{subscription}`
+
+#### pulsar.broker.topic.producer.count
+The number of active producers of the topic connected to this broker.
+* Type: UpDownCounter
+* Unit: `{producer}`
+
+#### pulsar.broker.topic.consumer.count
+The number of active consumers of the topic connected to this broker.
+* Type: UpDownCounter
+* Unit: `{consumer}`
+
+#### pulsar.broker.topic.message.incoming.count
+The total number of messages received for this topic.
+* Type: Counter
+* Unit: `{message}`
+
+#### pulsar.broker.topic.message.outgoing.count
+The total number of messages read from this topic.
+* Type: Counter
+* Unit: `{message}`
+
+#### pulsar.broker.topic.message.incoming.size
+The total number of messages bytes received for this topic.
+* Type: Counter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.message.outgoing.size
+The total number of messages bytes read from this topic.
+* Type: Counter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.publish.rate.limit
+The number of times the publish rate limit is triggered.
+* Type: Counter
+* Unit: `{event}`
+
+#### pulsar.broker.topic.consumer.msg.ack
+The total number of message acknowledgments received for this topic.
+* Type: Counter
+* Unit: `{ack}`
+
+#### pulsar.broker.topic.storage.size
+The total storage size of the messages in this topic.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.storage.logical.size
+The storage size of topics in the namespace owned by the broker without
replicas.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.storage.backlog.size
+The total backlog size of the topics of this topic owned by this broker.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.storage.offloaded.size
+The total amount of the data in this topic offloaded to the tiered storage.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.storage.backlog.quota.limit.size
+The size based backlog quota limit for this topic.
+* Type: Gauge
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.storage.backlog.quota.limit.time
+The time based backlog quota limit for this topic.
+* Type: Gauge
+* Unit: `{second}`
+
+#### pulsar.broker.topic.storage.backlog.quota.eviction.count
+The number of times a backlog was evicted since it has exceeded its quota.
+* Type: Counter
+* Unit: `{eviction}`
+
+#### pulsar.broker.topic.storage.backlog.age
+The age of the oldest unacknowledged message (backlog).
+* Type: Gauge
+* Unit: `{second}`
+
+#### pulsar.broker.topic.storage.outgoing
+The total message batches (entries) written to the storage for this topic.
+* Type: UpDownCounter
+* Unit: `{message batch}`
+
+#### pulsar.broker.topic.storage.incoming
+The total message batches (entries) read from the storage for this topic.
+* Type: UpDownCounter
+* Unit: `{message batch}`
+
+#### pulsar.broker.topic.compaction.removed.event.count
+The total number of removed events of the compaction.
+* Type: UpDownCounter
+* Unit: `{event}`
+
+#### pulsar.broker.topic.compaction.succeed.count
+The total number of successes of the compaction.
+* Type: UpDownCounter
+* Unit: `{event}`
+
+#### pulsar.broker.topic.compaction.failed.count
+The total number of failures of the compaction.
+* Type: UpDownCounter
+* Unit: `{event}`
+
+#### pulsar.broker.topic.compaction.duration
+The total time duration of compaction operations on the topic.
+* Type: DoubleUpDownCounter
+* Unit: `{second}`
+
+#### pulsar.broker.topic.compaction.incoming
+The total count of bytes read by the compaction process for this topic.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.compaction.outgoing
+The total count of bytes written by the compaction process for this topic.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.compaction.compacted.entries.count
+The total number of compacted entries.
+* Type: UpDownCounter
+* Unit: `{entry}`
+
+#### pulsar.broker.topic.compaction.compacted.entries.size
+The total size of the compacted entries.
+* Type: UpDownCounter
+* Unit: `{byte}`
+
+#### pulsar.broker.topic.transaction
+The number of transactions on this topic.
+* Type: UpDownCounter
Review Comment:
This metric has attributes for the tx status
([ref](https://github.com/apache/pulsar/pull/22467/files#diff-e3d8386fc3f9292780771f4eae19d9297637d374244f9c4b3f89b6c0e442e2e3R458-R470)):
`active`, `committed`, `aborted`. The latter two can be counters, but not the
first one.
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