resource-control:deleted-resource group still appear in available RU pannel

[AndreMouche]

removing iteam from availableRUCounter with three arguments maybe failed since it only have two lables

pd/pkg/mcs/resourcemanager/server/manager.go

Line 454 in 3d4c416

availableRUCounter.DeleteLabelValues(r.name, r.name, r.ruType)

pd/pkg/mcs/resourcemanager/server/metrics.go

Lines 117 to 123 in 3d4c416

	availableRUCounter = prometheus.NewGaugeVec(
	prometheus.GaugeOpts{
	Namespace: namespace,
	Subsystem: ruSubsystem,
	Name: "available_ru",
	Help: "Counter of the available RU for all resource groups.",
	}, []string{resourceGroupNameLabel, newResourceGroupNameLabel})

This would cause the resource group that has already been deleted to still appear in the resource-control->resource unit->available RU pannel. even though the data is already 0, we expect it not to appear any more.

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[okJiang]

/type bug