Exemplars and metrics (as of 1.9.0)

[pedro-leitao]

Hello,

I've gone through the documentation and code, but it is not clear to me what the current state of play is for exemplars and metrics.

Would something like:

counter.add(value, context)

Expose exemplars over the OTLP and Prometheus exporter ?

Thanks.

[jkwatson]

It definitely works for OTLP. Prometheus exemplars probably work, but there are bugs with it in 1.9.0; we're hoping to get a patch release out very soon to address the issues.

[jsuereth]

Prometheus doesn't support exemplars on counters, only histograms. This should be fixed. The general principal is we export what we can when it is supported