[FEATURE REQ] Enhance metrics for Azure Spring Event Hubs

[saragluna]

Context

We plan to expose metrics for Azure Spring Event Hubs related libraries to enable developers to view metrics about connection, messages states.

Spring Event Hubs metrics components:

Prefix: eventhubs.

Metric Name	Type	Tag	Description
connection.active	Gauge	eh namespace	The number of active connection.
connection.opened	Gauge	eh namespace	The number of open connection.
connection.closed	Gauge	eh namespace	The number of closed connection.
requests	Timer	eh namespace	Requests sent by client.
response.successes	Timer	eh namespace	Successful responses received.
response.errors	Timer	eh namespace	Errored responses received.
request.queue.latency	Timer	eh namespace	Average request queue latency waiting for request to be sent to broker.
request.queue.count	Timer	eh namespace	Number of requests in queue waiting to be sent to broker.
request.rtt	Timer	eh namespace	Average request latency / round-trip-time to broker and back.
consumer.poll.latency	Timer	eh namespace	The time it takes poll() to return a new message to the application.

For the SCS binder:

Prefix: spring.cloud.stream.binder.eventhubs.

Metric Name	Type	Tag	Description
offset	Gauge	EventHub, ConsumerGroup	Unconsumed messages for a particular group and event hub

Reference of Kafka: https://cwiki.apache.org/confluence/display/KAFKA/KIP-714:+Client+metrics+and+observability#KIP714:Clientmetricsandobservability-Clientmetricsandmetriclabels

Next Step

To support Spring Event Hubs metrics, currently we need the support from Event Hubs SDK to enable and expose metrics APIs. Tracked in #25605

[saragluna]

Link #19391

[cykl]

Hey @saragluna

How do you plan to compute offset? Will those metrics be available to non Spring users? (i.e. sdk compute metrics and Azure Spring Event Hubs bind them to Spring / Micrometer)

[saragluna]

@cykl here's the issue used to track supporting metrics in AMQP libraries #25605.

[github-actions]

Hi @saragluna, we deeply appreciate your input into this project. Regrettably, this issue has remained inactive for over 2 years, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.