OTLP to Zipkin for Trace exporting

[lxx95]

Hi all,

Trying to export traces from Otel-Demo (with receiver in OTLP format) to Zipkin backend (as suggested here by @wu-sheng).

Here my otel-collector:

receivers:
      otlp:
        protocols:
          grpc:
    exporters:
      zipkin:
        endpoint: "skywalking-oap.skywalking.svc.cluster.local:9411"
        tls:
          insecure: true
      logging:
processors:
      batch:
service:
      pipelines:
        traces:
          receivers: [otlp]
          processors: [batch]
          exporters: [zipkin, logging]

This error message has been shown for exporting phase (from otel-collector):
2023-05-04T14:56:27.171Z error exporterhelper/queued_retry.go:175 Exporting failed. No more retries left. Dropping data. {"kind": "exporter", "data_type": "traces", "name": "zipkin", "error": "max elapsed time expired failed to push trace data via Zipkin exporter: Post \"skywalking-oap.skywalking.svc.cluster.local:9411\": unsupported protocol scheme \"skywalking-oap.skywalking.svc.cluster.local\"", "dropped_items": 5}

The zipkin backend (Skywalking OAP) port and endpoint was fine:
skywalking-oap ClusterIP 10.99.240.73 <none> 11800/TCP,12800/TCP,9411/TCP 27m

Note: I have also tried with "skywalking-oap.skywalking.svc.cluster.local:9411/api/v2/spans", the same message was shown

Thank you,
Luigi

[atoulme]

This endpoint needs to start with http:// or https://. The scheme is otherwise detected as invalid.