Micronaut and Metrics

[cemo]

Hi, I am trying to understand the process of how metrics are working. Since currently I see no metrics on our micronaut based application, I am trying to figure out how things are working. The libraries we are using are supported by opentelemetry as well. I can not understand why metrics are not available.

Can someone enlight me please about it?

[iNikem]

We currently only produce traces, not metrics, from instrumented libraries. Because OpenTelemetry Java API/SDK does not provide yet support for metrics. Because metrics part of the specification is not stabilised yet.

[cemo]

@iNikem I see some metrics such as runtime_jvm_memory_pool on metrics endpoint. What are these numbers?

[iNikem]

I am actually not sure. @mateuszrzeszutek do you know anything about this?

[mateuszrzeszutek]

We do produce some metrics, like the runtime metrics for example. We haven't been actively working on adding more metrics (to popular HTTP frameworks for example) because of the API/SDK unstability, and until it becomes stable those few runtime metrics will probably be all you can observe.

[cemo]

Hi, I started to see some progress on towards on metrics implementations. Where can I see its documentation and existing metrics per libraries?

[mateuszrzeszutek]

Hey @cemo ,
Right now we still don't have that many metrics instrumentations, the work on that has pretty much just started recently. We capture HTTP metrics in all HTTP client & server instrumentations, and a couple of JVM metrics for which we don't have any docs - they're bound to change anyway soon.