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shalper2
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…elemetry#40559) <!--Ex. Fixing a bug - Describe the bug and how this fixes the issue. Ex. Adding a feature - Explain what this achieves.--> #### Description Prometheus remote write exporter add extra logs for the RW2 code path. <!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. --> #### Link to tracking issue Fixes Partially implements open-telemetry#33661 (when merging PR please don't close the tracing issue) <!--Describe what testing was performed and which tests were added.--> #### Testing * [x] e2e ran with prometheus locally Sample of the logs running against both Prometheus `v3.4.1` and `v2.53.1` (which doesn't support RW2).  ``` 2025-06-09T17:15:44.390+0200 info [email protected]/server.go:886 [core] [Server #1 ListenSocket open-telemetry#2]ListenSocket created {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "grpc_log": true} 2025-06-09T17:15:52.173+0200 warn prometheusremotewriteexporter/exporter.go:420 X-Prometheus-Remote-Write-Samples-Written header is missing from the response, suggesting that the endpoint doesn't support RW2. {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "url": "http://localhost:9091/api/v1/write"} 2025-06-09T17:15:53.968+0200 warn prometheusremotewriteexporter/exporter.go:420 X-Prometheus-Remote-Write-Samples-Written header is missing from the response, suggesting that the endpoint doesn't support RW2. {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "url": "http://localhost:9091/api/v1/write"} 2025-06-09T17:15:57.164+0200 warn prometheusremotewriteexporter/exporter.go:420 X-Prometheus-Remote-Write-Samples-Written header is missing from the response, suggesting that the endpoint doesn't support RW2. {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "url": "http://localhost:9091/api/v1/write"} 2025-06-09T17:15:58.966+0200 warn prometheusremotewriteexporter/exporter.go:420 X-Prometheus-Remote-Write-Samples-Written header is missing from the response, suggesting that the endpoint doesn't support RW2. {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "url": "http://localhost:9091/api/v1/write"} 2025-06-09T17:16:02.164+0200 debug prometheusremotewriteexporter/exporter.go:425 X-Prometheus-Remote-Write-Samples-Written {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "samples_written": "22"} 2025-06-09T17:16:02.164+0200 debug prometheusremotewriteexporter/exporter.go:428 X-Prometheus-Remote-Write-Histograms-Written {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "histograms_written": "0"} 2025-06-09T17:16:02.164+0200 debug prometheusremotewriteexporter/exporter.go:431 X-Prometheus-Remote-Write-Exemplars-Written {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "exemplars_written": "0"} 2025-06-09T17:16:03.967+0200 debug prometheusremotewriteexporter/exporter.go:425 X-Prometheus-Remote-Write-Samples-Written {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "samples_written": "290"} 2025-06-09T17:16:03.967+0200 debug prometheusremotewriteexporter/exporter.go:428 X-Prometheus-Remote-Write-Histograms-Written {"resource": {"service.instance.id": "383f7fdd-08e5-4e4c-85fe-c1fe3002d1ba", "service.name": "otelcontribcol", "service.version": "0.127.0-dev"}, "otelcol.component.id": "prometheusremotewrite/prometheus", "otelcol.component.kind": "exporter", "otelcol.signal": "metrics", "histograms_written": "0"} ``` cc @krajorama @ywwg
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