Add request latency histogram metric#872
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Expose granian_request_duration_seconds, a per-worker Prometheus histogram of application request durations. Static-file requests are excluded. Adds a LatencyHistogram to WorkerMetrics, a MetricValue::Hist variant for IPC transport, histogram exposition in the aggregator, and integration tests covering exposition, counts, static exclusion and the empty case. Co-authored-by: GitHub Copilot <copilot@github.com>
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Solves #871
Note: AI implemented. I'm not familiar with Rust. I've reviewed the code. I apologize if this is seen as too much AI slop :)
Expose granian_request_duration_seconds, a per-worker Prometheus histogram of application request durations. Static-file requests are excluded.
Adds a LatencyHistogram to WorkerMetrics, a MetricValue::Hist variant for IPC transport, histogram exposition in the aggregator, and integration tests covering exposition, counts, static exclusion and the empty case.
Co-authored-by: GitHub Copilot copilot@github.com