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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