scheduler monitoring inacurrate

[3AceShowHand]

The unkown-0 should not be recorded and displyed

[wk989898]

Each state will be recorded, and may there be unknown when an error occurs?

tiflow/cdc/scheduler/internal/v3/replication/replication_manager.go

Lines 841 to 863 in 995ea76

	var stateCounters [6]int
	r.spans.Ascend(func(span tablepb.Span, table *ReplicationSet) bool {
	switch table.State {
	case ReplicationSetStateUnknown:
	stateCounters[ReplicationSetStateUnknown]++
	case ReplicationSetStateAbsent:
	stateCounters[ReplicationSetStateAbsent]++
	case ReplicationSetStatePrepare:
	stateCounters[ReplicationSetStatePrepare]++
	case ReplicationSetStateCommit:
	stateCounters[ReplicationSetStateCommit]++
	case ReplicationSetStateReplicating:
	stateCounters[ReplicationSetStateReplicating]++
	case ReplicationSetStateRemoving:
	stateCounters[ReplicationSetStateRemoving]++
	}
	return true
	})
	for s, counter := range stateCounters {
	tableStateGauge.
	WithLabelValues(cf.Namespace, cf.ID, ReplicationSetState(s).String()).
	Set(float64(counter))
	}