feat: Tracing agent -> tracker -> origin #554
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Pull request overview
This PR adds distributed tracing support for the metainfo retrieval path from agent through tracker to origin, enabling end-to-end observability of blob metadata requests.
Changes:
- Added context parameter to
GetMetaInfoandDownloadmethods throughout the codebase to enable trace context propagation - Implemented OpenTelemetry tracing spans in origin cluster client, origin client, and agent storage components
- Added trace header propagation in tracker nginx configuration
Reviewed changes
Copilot reviewed 19 out of 19 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| tracker/trackerserver/server.go | Minor formatting improvement to function signature |
| tracker/trackerserver/metainfo_test.go | Updated test to pass context and use gomock.Any() for context parameter matching |
| tracker/trackerserver/metainfo.go | Modified to pass request context to origin cluster GetMetaInfo call |
| tracker/metainfoclient/testing.go | Updated TestClient interface to accept context parameter |
| tracker/metainfoclient/client.go | Added context parameter to Download method and implemented trace context propagation |
| proxy/proxyserver/server_test.go | Updated mock expectations to include context parameter |
| proxy/proxyserver/preheat.go | Added context.Background() to GetMetaInfo calls |
| origin/blobserver/server_test.go | Updated test calls to include context.Background() |
| origin/blobserver/cluster_client_test.go | Updated test calls and mock expectations for context parameter |
| origin/blobclient/cluster_client.go | Added OpenTelemetry tracing implementation with span creation, error recording, and status tracking |
| origin/blobclient/client.go | Added OpenTelemetry tracing implementation for GetMetaInfo method |
| nginx/config/tracker.go | Added proxy headers for trace context propagation (traceparent, tracestate, jaeger-debug-id) |
| mocks/tracker/metainfoclient/client.go | Updated mock to reflect new interface signature with context |
| mocks/origin/blobclient/clusterclient.go | Updated mock to reflect new interface signature with context |
| mocks/origin/blobclient/client.go | Updated mock to reflect new interface signature with context |
| lib/torrent/storage/agentstorage/torrent_archive_test.go | Updated test expectations to include gomock.Any() for context |
| lib/torrent/storage/agentstorage/torrent_archive.go | Added tracing implementation and context propagation from agent storage |
| lib/torrent/scheduler/scheduler_test.go | Updated all test expectations to include gomock.Any() for context |
| lib/torrent/scheduler/events_test.go | Updated test expectation to include gomock.Any() for context |
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Anton-Kalpakchiev
approved these changes
Feb 2, 2026
| ctx, span := otel.Tracer("kraken-origin-cluster").Start(ctx, "cluster.get_metainfo", | ||
| trace.WithSpanKind(trace.SpanKindClient), | ||
| trace.WithAttributes( | ||
| attribute.String("component", "origin-cluster-client"), |
Collaborator
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Can we extract the component string to the top of the file in a constant to ensure we are always consistent when using it? Asking for the single origin client too.
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This PR adds distributed tracing support for the metainfo retrieval path from agent through tracker to origin, enabling end-to-end observability of blob metadata requests.
Changes: