Wire the fourth mandated §23 metric to a real producer. The histogram
spans two reconcile passes, so anchor and observation must persist in
status:
- Add status.startRequestedAt, set once on the first Starting reconcile
of a start attempt and cleared on Stopped so the next start re-anchors.
- Observe felis_start_duration_seconds exactly when readiness is first
reached (ReadySignalAt - StartRequestedAt), guarded so a server that
reaches ready without a Starting pass records nothing.
- Mirror the field into the deepcopy and the structural CRD schema so the
apiserver does not prune it on patchStatus round-trips.
- Promote prometheus/client_golang and client_model to direct deps now
that the operator and its tests import them.
Tests drive a step clock through Starting -> Running asserting the exact
observed duration, and through Running -> Stopped asserting the metric is
observed once and the anchor clears.
A per-object reconcile cannot maintain felis_servers_total (spec §23): it
sees one server per call, so it could never Set a correct fleet-wide gauge
and inc/dec on transitions would drift on any missed event. Add a snapshot
producer instead.
metrics.SyncServerGauge Resets the GaugeVec then Sets one child per state,
so a state that drains to zero reports 0 rather than a stale last value.
operator.GaugeSyncer is a manager.Runnable that periodically Lists the
fleet and republishes from it, defaulting an unset desiredState to Stopped.
SyncOnce is exercised end-to-end against a fake client (List, default,
republish); the ticker loop in Start is the only untested I/O edge.
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