3.4.19 + Ktor OpenTelemetry - ClassCastException

[omni-htg]

3.4.19 + Ktor OpenTelemetry - ClassCastException

[jeanbisutti]

@omni-htg Instead of adding and configuring the Ktor instrumentation library, you can enable the Ktor automatic instrumenation provided by Application Insights:

{
  "preview": {
    "instrumentation": {
      "ktor": {
        "enabled": true
      }
    }
  }
}

Please let us know if it works for you.

[omni-htg]

Thank you, @jeanbisutti !

I have tried using the APPLICATIONINSIGHTS_PREVIEW_INSTRUMENTATION_KTOR_ENABLED environment variable and removing the OpenTelemetry Ktor instrumentation library, which seems to work with 3.4.19.

I do have a couple of questions though:

• Is there a reason this stopped working from 18 to 19?
• How can I confirm that the automatic instrumentation is enabled?
• By removing the OpenTelemetry Ktor library, I lose access to the OpenTelemetry operations, like accessing TraceId or adding Custom Dimensions.

Thanks once again for your assistance.

[trask]

Is there a reason this stopped working from 18 to 19?

I suspect this may be a bug, fixed upstream already but not released yet: open-telemetry/opentelemetry-java-instrumentation#10026

you can try to workaround the bug by adding this dependency to your application: io.opentelemetry:opentelemetry-sdk-extension-incubator:1.32.0-alpha

[omni-htg]

Hey @trask !

Just tried adding that package to the project and use 19 again -- same results.
Thank you for trying!

If you have another workaround in mind, please let me know.
Else, what is the ETA for that bugfix?

[omni-htg]

Hello team!

Is there any other input I could provide to help get to the bottom of this issue?

Thanks!