feat: trace chatd provider attempts with model and effort - #28971
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Wrap the provider transport in stageSpanRoundTripper, which opens one provider_attempt stage per HTTP round trip so retried requests each get their own span, labeled with the HTTP method, host, and status code. resolveModelCall resolves the effective reasoning effort once and carries it with the model name as a StageModel through modelBuildOptions so the transport labels attempts the way the call options were sent. The Server gains the StageTracer and a TracerProvider config field that coderd wires from its own tracer provider.
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Wraps the provider HTTP transport in
stageSpanRoundTripper, which emits oneprovider_attemptstage per round trip so retried requests each get their own span. The span closes on response headers; HTTP status >= 400 marks the span as errored without changing what is returned to the client.The resolved model and the effective reasoning effort are resolved once in
resolveModelCalland threaded to the transport viamodelBuildOptions.StageModel, so the span attributes and themodellabel match the call. Effort is carried on spans asreasoning_effortonly; it is not a metric label.Servergains thestagestracer and aTracerProviderconfig option (nil disables tracing without disabling metrics), wired fromcoderd.Part of the chatd lifecycle observability stack: 1 extract step · 2 stage tracer · 3 stream stages · 4 provider attempts · 5 turn span · 6 capacity wait · 7 turn accounting · 8 dashboard. Supersedes the experimental branch in #28741.
🤖 This PR was generated by Coder Agents on behalf of @jscottmiller.