How to add application logs to spans

[Suedo]

Below is my auto-instrumentation config:

-Dotel.traces.exporter=jaeger
-Dotel.metrics.exporter=none
-Dotel.exporter.jaeger.endpoint=http://localhost:14250
-Dotel.resource.attributes=service.name=myService
-javaagent:C:/path/to/opentelemetry-javaagent-1.0.1-all.jar

I am using Jaegar as the backend, and in the trace that comes up, I would want to add application logs (we use logback) to the spans. Is that possible?

[trask]

hey @Suedo! OpenTelemetry focus was initially on tracing, now on metrics, and after that logging, so we are definitely planning to address this use case, but don't have anything in instrumentation yet (OpenTelemetry logging is still going through specs, then SDK, then instrumentation).

Currently, the only thing that the instrumentation supports around logging is https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/logger-mdc-instrumentation.md.

[itsprakash84]

@Suedo ,

I do have same requirement, any luck on customer logback appender? if yes so please point me there.

@trask ,
Do you have roadmap for logback/log4j auto instrumentation support?

[trask]

hey @itsprakash84! check out and follow #3055

[Suedo]

Hey @trask , while playing with OTEL + Jaegar, I saw that currentSpan.recordException(throwable) results in a Log section in the span. Is there a way to make this Log section appear for non-exception cases also?

ps; office machine, so had to redact most stuff, sorry for the ugliness

[iNikem]

Exceptions are recorded as span events. I believe jaeger exporter converts them to Jaeger logs. You can add arbitrary events to spans via Otel API.

[Suedo]

Awesome! This works really well! I followed this span event guide and I can see the details in a Log section! @iNikem can you mention this as a separate answer, then I can mark that one as the fix

@itsprakash84 take a look, u might find this useful

[iNikem]

Exceptions are recorded as span events. I believe jaeger exporter converts them to Jaeger logs. You can add arbitrary events to spans via Otel API.

[itsprakash84]

Thank you @somjit Nag ***@***.***> , I have implemented this sometime back. BTW, has anyone tried exporting custom metrics using otel?

…

On Wed, Aug 11, 2021 at 2:58 PM Nikita Salnikov-Tarnovski < ***@***.***> wrote: Exceptions are recorded as span events. I believe jaeger exporter converts them to Jaeger logs. You can add arbitrary events to spans via Otel API. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2969 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABQ4WXPXU3IN2US2UXQYHTTT4I7FHANCNFSM44YA6VKA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&utm_campaign=notification-email> .

-- *Regards,* *Sathya Prakash*