dragosvictor commented on code in PR #880:
URL: https://github.com/apache/pulsar-site/pull/880#discussion_r1576587699
##########
docs/reference-metrics-opentelemetry.md:
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@@ -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.
Review Comment:
This particular metric is not currently populated by the implementation.
I'll remove it from the doc until it is.
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