feat(O10): Prometheus metrics module + /metrics endpoint

- metrics.rs: Counter, Gauge, GaugeF64, Histogram, LabeledCounter types
- Timer RAII helper for automatic latency observation
- All O1-O9 metric definitions pre-declared (119 metrics total)
- render_metrics() outputs Prometheus text exposition format
- GET /metrics endpoint registered in http_server
- HTTP/LLM/DB latency buckets defined
- 6 unit tests passing

This commit is contained in:

rock

2026-09-13 21:34:37 +09:00

parent 66cc282b6d

commit fd63b089f8

4 changed files with 621 additions and 0 deletions

									
										crates/mem-cli/Cargo.toml
									
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				@@ -46,3 +46,4 @@ futures-util = "0.3"

				async-stream = "0.3"

				rand = "0.8"

				lru = "0.12"

				once_cell = { workspace = true }