Add a list of observations produced by Spring Framework

[dambott]

Affects: <Spring Framework version>
All versions

Please add a comprehensive list of metrics that are generated by the framework so they can be properly understood by anyone trying to use them.
For reference, please see:
https://kubernetes.io/docs/reference/instrumentation/metrics/
and this:
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/viewing_metrics_with_cloudwatch.html
for the type of thing I am looking for.

[bclozel]

This should be covered by this section in the reference documentation.

https://docs.spring.io/spring-framework/docs/current/reference/html/integration.html#integration.observability.http-server

Please let us know is something is missing.

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[spring-projects-issues]

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[dambott]

The referenced section does NOT provide the detail I requested. There's no list of metrics or their meanings there. Please provide something like the links I provided.

[bclozel]

We're not creating metrics per se, we're creating observations. Those observations can then be exported as timer metrics or traces or anything else really, depending on the ObservationHandler instances configured with your registry.

We don't have much there right now, but we'll expand that in the future. Would the following table fill that need?

Observation name	Description
"http.client.requests"	Time spent for HTTP client exchanges
"http.server.requests"	Processing time for HTTP server exchanges at the Framework level