APP Connect Enterprise Opentelemetry Exporter needs additional header to send OTLP data

Dear colleagues,

A customer wants to trace ACE with Instana using native tracing, for that we have an Instana documentation:

https://www.ibm.com/docs/en/instana-observability/current?topic=ace-configuring-tracing-in#configuring-ace-native-tracing that refers to ACE page: https://www.ibm.com/docs/en/app-connect/12.0?topic=management-configuring-opentelemetry-trace-integration-server for configuring OpenTelemetryManager.

But once they follow the procedure they see errors in log that additional key is required: BIP9570E: OpenTelemetry error: '[OTLP TRACE GRPC Exporter] Export() failed with status_code: "INTERNAL" error_message: "Header x-instana-key is missing"' - '[]'.

The header is required for Instana when OTLP data is being sent to Instana backend directly and uses the header to differentiate to which tenant the environment belongs. Following the links above it looks like OpenTelemetryManager doesn't allow to specify the HTTP headers.

it works perfect when I specify header X-INSTANA-KEY for example for HTTP way like:

curl -kL -XPOST -H "X-INSTANA-KEY: ${AGENT_KEY}" -H "Content-Type: application/json" https://otlp-http.${INSTANA_BACKEND}/v1/traces --data '{"resourceSpans": [{"resource": {"attributes": [{"key": "service.name","value": {"stringValue": "my.service"}}]},"scopeSpans": [{"spans": [{"traceId": "5b8aa5a2d2c872e832","spanId":"051581bf3cb55c14","name": "I am a span!","startTimeUnixNano": 1689969302000000000,"endTimeUnixNano": 1689970000000000000,"attributes": [{"key": "my.span.attr","value": {"stringValue": "some value"}}]}]}]}]}'

Please consider adding the functionality to OpenTelemetryManager.

Thank you