Module metrics 

Available on crate feature serve only.

faucet_serve_* request metrics. The path label is the matched route template (/v1/runs/{id}), never the raw path — cardinality safety.

Functions

inc_run_logs_purged

Count persisted run-log lines purged by the retention loop (#529).

matched_path_label

The matched route template for a request, or <unmatched> for a 404.

record_idempotency_hit

Count an idempotency-key replay hit.

record_run_finished

Count a run reaching a terminal state, labelled by status + a finer reason.

record_runs_claimed

Count runs claimed by this instance’s claim loop.

record_runs_reclaimed

Count failover reclaims, split by outcome.

record_shards_claimed

Count source shards claimed for execution by this instance (Mode B, #230).

record_shards_reclaimed

Count shard reclaims (rebalance), split by outcome (Mode B, #230).

set_cluster_enabled

1 when clustered execution is enabled for this instance, else 0.

set_cluster_instances

Live cluster member count (refreshed each lease-loop tick).

set_history_degraded

Set the run-history degraded gauge (1 once the persistent backend has fallen back to in-memory; drives alerting alongside /readyz).

set_run_gauges

Refresh the queue-depth + in-flight gauges from the registry. Called on every queue transition (submit, queued→running, finish).

track_metrics

Middleware: count every request + record its duration, labelled by method, matched-path template, and response status.