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houseme
a8eed1c44d
The io-metrics crate already had per-stage GET/PUT switches, but the request headers/summaries and ~40 general recorders (I/O scheduler, bytes-pool, zero-copy, bandwidth, system-resource, error/timeout/retry) emitted unconditionally, paying their label allocations and arithmetic even when no metric recorder is installed. Add `METRICS_ENABLED: AtomicBool` (default false) with `set_metrics_enabled()` / `metrics_enabled()`, isomorphic to the existing stage switches, and gate: - GET headers/summaries via `get_stage_metrics_enabled()`: record_get_object_request_start / _request_started / _request_result / _timeout / _completion / _total_duration_with_path, plus legacy record_get_object. - PUT headers via `put_stage_metrics_enabled()`: record_put_object_request_start / _request_result, plus legacy record_put_object. - 41 general recorders via `metrics_enabled()`. Startup enables all three switches together under `observability_metric_enabled()` (startup_observability.rs), with a passthrough in startup_runtime_sources.rs. The global recorder is itself only installed when observability metric export is on, so gating off is pure cost savings when export is disabled and a no-op when it is enabled. Deliberately NOT gated (would break function, not just observation): the EC encode in-flight and GET buffered-bytes accounting guards (add/remove_ec_encode_inflight_bytes, track_get_object_buffered_bytes) whose values are read back by current_*; and the stateful sibling modules (lock/deadlock/backpressure/autotuner/adaptive_ttl/collector/internode). The console realtime metrics endpoint (/admin/v3/metrics) samples system state and internode metrics directly, so it does not depend on the gated recorders. Adds a toggle test exercising both the enabled and disabled paths, serialized on the existing METRICS_FLAG_LOCK to stay robust under nextest's shared-process model. Co-authored-by: heihutu <heihutu@gmail.com>