Friends,
I wrote about this issue some months ago when I was trying to put together a
company wide demo and running out of time. My apologies for not following
through.
I'm attempting to write a simple Java Spring framework app that serves as a
working example of the metric and logging practices we'd like to follow as our
standards. I've been trying for a while now to get exemplar support working to
demo how to pivot from metrics to traces, but I've never been successful in
getting exemplars to appear.
I've copied the example code to GitHub.
https://github.com/jjneely/java-exemplar-example
This is a super simple Gradle / Spring Boot app and running "./gradlew bootrun"
should get it up and running. Log output will indicate if exemplar support is
enabled and it should be as it runs with the OpenTelemetry Agent 1.9.1.
However, using curl against the metric endpoint does not show exemplars and
having Prometheus scrape the endpoint does not show exemplars.
$ curl -H 'Accept: application/openmetrics-text; version=1.0.0;
charset=utf-8' http://localhost:8081/
I've manually added exemplar values in the code, yet no luck. I feel like I'm
missing something simple here. I'm hoping this issue is reproducible and
someone can help me figure out what I've missed here.
I've also sent a note in the CNCF Slack:
https://cloud-native.slack.com/archives/C167KFM6C/p1641494335010700
Thanks for the help! Now that I'm not under a time crunch I promise to get
back to folks.
Jack Neely
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