Custom metrics with auto-instrumentation

[glisicivan]

Is it possible to send custom metrics with auto-instrumentation? For example, I want to send http request, and then extract some data from the response and send that data as metric.
If this is possible, can you point me to some example. Thanks!

[legendecas]

As for now, we don't provide many metric instrumentations yet since the metric SDK is still under active development. Still, one of the instrumentations could be found here: https://github.com/open-telemetry/opentelemetry-js-contrib/tree/main/packages/opentelemetry-host-metrics

However, if you are implementing instrumentation, you can get the meter with https://github.com/open-telemetry/opentelemetry-js/blob/main/experimental/packages/opentelemetry-instrumentation/src/instrumentation.ts#L69.

[glisicivan]

@legendecas thanks for the answer. So, if I understand correctly, the only way for this scenario is to create my own plugin, like described here: https://github.com/open-telemetry/opentelemetry-js/tree/main/experimental/packages/opentelemetry-instrumentation?

[legendecas]

If you are exporting your own metrics, you don't need to write an instrumentation. You can use v0.27.0 metrics API and metrics SDK directly.

[glisicivan]

I meant if I still want to use auto instrumentation, then custom plugin would be only solution. Correct?

[legendecas]

Right, auto instrumentation can only be used with instrumentations.