metrics

type Metrics struct {

	// HTTPRequestsTotal counts completed HTTP requests, labeled by HTTP
	// method, request path, and response status code.
	//
	// TODO: switch the "path" label to chi's route pattern
	// (chi.RouteContext(r.Context()).RoutePattern()) to avoid high cardinality
	// from parameterised segments such as /api/v1/jobs/{id}.
	HTTPRequestsTotal *prometheus.CounterVec

	// HTTPRequestDuration records request latency in seconds, labeled by HTTP
	// method and request path.
	HTTPRequestDuration *prometheus.HistogramVec

	// SchedulerQueueDepth is the current number of ready tasks waiting for
	// assignment in each named queue. Set by the scheduler.
	SchedulerQueueDepth *prometheus.GaugeVec

	// SchedulerTasksTotal counts task completions, labeled by queue name and
	// terminal status (succeeded, failed, canceled). Incremented by the
	// scheduler.
	SchedulerTasksTotal *prometheus.CounterVec

	// SchedulerAssignmentDuration records the wall-clock time spent in a
	// single call to tryAssign, labeled by result:
	//   - "assigned"  — a worker was found and the task was dispatched.
	//   - "deferred"  — no eligible worker or policy blocked; task stays ready.
	//   - "error"     — an unexpected error aborted the attempt.
	//
	// Populated by the scheduler assignment loop.
	SchedulerAssignmentDuration *prometheus.HistogramVec

	// SchedulerIdleWorkers is the current count of online workers that have no
	// task in 'assigned' or 'running' state, partitioned by farm ID.
	// Updated by the scheduler after each worker-registry or sweep event.
	SchedulerIdleWorkers *prometheus.GaugeVec

	// WorkersTotal is the current number of registered workers, partitioned by
	// status: online, offline, or disabled. Set by the worker registry.
	WorkersTotal *prometheus.GaugeVec

	// NATSPublishedTotal counts messages published to the embedded NATS broker,
	// labeled by subject. Incremented by the typed bus client.
	NATSPublishedTotal *prometheus.CounterVec

	// NATSConsumedTotal counts messages consumed from the embedded NATS broker,
	// labeled by subject. Incremented by the typed bus client.
	NATSConsumedTotal *prometheus.CounterVec

	// DBQueryDuration records SQLite query execution time in seconds, labeled
	// by operation name (e.g. "job.insert", "task.list"). Observed by the store
	// implementation.
	DBQueryDuration *prometheus.HistogramVec

	// UsageActiveClaims is the current number of active (unreleased)
	// usage-pool claims for each named pool. Updated by the scheduler on every
	// dispatch tick.
	UsageActiveClaims *prometheus.GaugeVec
	// contains filtered or unexported fields
}