This error means Phoenix (the OpenTelemetry collector endpoint) is returning a 500 Internal Server Error when your app tries to export spans. Common causes include sending spans with incorrect or unsupported semantic conventions, or the Phoenix server being overloaded or misconfigured. Double-check that your spans use valid OpenInference conventions and that your Phoenix server is healthy and reachable. If you are manually instrumenting, ensure your span kind and attributes are valid鈥攊nvalid values can trigger this error, as discussed in <https://github.com/Arize-ai/phoenix/issues/2950|Phoenix issue #2950>.
If the error persists, check Phoenix server logs for more details about the failure. Also, ensure your ECS Fargate tasks can reach the Phoenix endpoint and that there are no network or authentication issues. Would you like more detail on debugging or validating your span data?
Sources:
- <https://github.com/Arize-ai/phoenix/issues/2950|Phoenix issue #2950>
