Ruby layer fails with unable to export span error

[spongenee]

After adding layer arn:aws:lambda:us-east-1:184161586896:layer:opentelemetry-ruby-dev-0_6_0:1 to my functions, I see the following logs that indicate otel instrumentation being successfully initiated

It seems to be a timeout error and spits 30 seconds after INIT_START

E, [2025-05-01T20:46:04.837794 #8] ERROR 89e2f268-5c45-49d2-8eda-4886885eb39b -- : OpenTelemetry error: Unable to export 1 spans

[xuan-cao-swi]

My initial guess is the endpoint for otlp span exporter (e.g. unable to reach the endpoint) that cause the long running and unable to export issue.

Could you set OTEL_LOG_LEVEL to debug to see if there are more information.

[spongenee]

thank you! it's because there was no collector setup. Once I added the collector layer it was working.

But I had another issue, the README says outgoing http request tracing is supported for auto-instrumentation but it doesn't seem to be the case with the Ruby layer. Is there anything I need to configure for this feature?

The logs I am seeing from the layer now:

INIT_START Runtime Version: ruby:3.2.v58	Runtime Version ARN: arn:aws:lambda:us-east-1::runtime:xxx
TELEMETRY	Name: collector	State: Subscribed	Types: [Platform] 
D, [2025-05-05T14:44:40.245360 #15] DEBUG  -- : Upgrading default proxy tracer provider to OpenTelemetry::SDK::Trace::TracerProvider 
I, [2025-05-05T14:44:40.247941 #15]  INFO  -- : Instrumentation: OpenTelemetry::Instrumentation::AwsLambda was successfully installed with the following options {}
EXTENSION	Name: collector	State: Ready	Events: [INVOKE, SHUTDOWN]

[spongenee]

Also I was trying to propagate the lambda context (not the sdk traces are separate from the lambda traces) according to https://opentelemetry.io/docs/specs/semconv/faas/aws-lambda/#xray-lambda-propagator-configuration
But with the environment variable configured I see W, [2025-05-05T15:08:51.613327 #16] WARN -- : The xray-lambda propagator is unknown and cannot be configured in the logs.

Is there a way to consolidate the traces through the layer configuration?

[spongenee]

looks like this was only recently supported 😿 open-telemetry/opentelemetry-ruby-contrib#1464

[xuan-cao-swi]

Unfortunately current ruby lambda layer is not able to instrument other libraries except the lambda itself.
I will start to work on updating the ruby layer soon.

[spongenee]

thank you!