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Sending Metrics of Kafka App to Signoz Otel Collector

TLDR Shubham wanted advice to send metrics to a signoz otel collector. nitya-signoz provided guidance and Srikanth confirmed using the collector for Kafka server telemetry.

7mo

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Apr 27, 2023 (7 months ago)

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Shubham

10:58 AM

I want to send metrics of a kafka app to signoz otel collector in a different eks cluster, I have made the otel collector publically available using virtual-service & pvt-gateway ,but the otelagent jar throws error OTLP endpoint must be a valid URL
How to implement this??

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nitya-signoz

10:59 AM

Can you share the value of otlp endpoint you are passing ?

Shubham

11:00 AM

https://signoz-collector-qa.fcinternal.in

nitya-signoz

11:06 AM

it will look something like this https://signoz-collector-qa.fcinternal.in:4317

cc Prashant

Shubham

11:09 AM

tried it, same error

nitya-signoz

11:15 AM

Can you share the entire command that you are using to run your jar?

Shubham

11:19 AM

export EXTRA_ARGS='-Dotel.exporter.otlp.endpoint="" -Dotel.resource.attributes=service.name=kafka-test -javaagent:/opentelemetry-javaagent.jar'

exec $base_dir/kafka-run-class $EXTRA_ARGS kafka.Kafka "$@"

nitya-signoz

11:23 AM

Interesting, can you try using env vars like this and check if the same error occurs ?

OTEL_EXPORTER_OTLP_ENDPOINT="" OTEL_RESOURCE_ATTRIBUTES=service.name=petclinick java -javaagent:"~/opentelemetry-javaagent-1.jar" -jar target/*.jar

Shubham

11:25 AM

but that won't send metrics to signoz collector

11:25

Shubham

11:25 AM

???

nitya-signoz

11:26 AM

Sorry didn’t get you.

Shubham

11:28 AM

will this send metrics to otel-collector in eks cluster ?

nitya-signoz

11:28 AM

Yes it will.

11:28

nitya-signoz

11:28 AM

We have an example application here https://github.com/SigNoz/spring-petclinic

Shubham

11:28 AM

11:31

Shubham

11:31 AM

should i use these envs also to start the service??

nitya-signoz

11:32 AM

If you are running the otel agent with your service then you will need to add these env vars

Shubham

11:34 AM

does it matter that i am trying to export metrics of a kafka app?

nitya-signoz

11:38 AM

No in that case it doesn’t matter to add them to your services.

Shubham

11:41 AM

i mean i am adding it to the kafka start command

nitya-signoz

11:52 AM

So you just want your Kafka server metrics. While I haven’t personally tried this out, you can check out this demo doc by Otel https://opentelemetry.io/docs/demo/services/kafka/

You can also check out this kafka metrics receiver https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/kafkametricsreceiver/README.md

Srikanth any more ideas on monitoring the Kafka server?

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Srikanth

12:07 PM

It’s unclear if they are interested in the Kafka server or language client instrumentation; it seems they want to collect the client metrics. None of that is relevant to the original error. Can you share the full run command?

May 03, 2023 (7 months ago)

Shubham

05:28 AM

we want instrumentation of the kafka server??

Srikanth

06:20 AM

Is that a question or confirmation?

Shubham

11:37 AM

sorry,confirmation

Srikanth

01:09 PM

If you are interested in the telemetry of the Kafka server, you need to use the collector https://github.com/open-telemetry/opentelemetry-collector-contrib/tree/main/receiver/kafkametricsreceiver. Let us know if that helps or you need more clarification.

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