[Grafana] Use Range option instead of instant for RayCluster Provisioned Duration panel

[win5923]

Why are these changes needed?

Since #3923 being merged, metrics related to deleted CRs are also removed.

Currently, if users want to see historical information for metrics such as:

• kuberay_cluster_provisioned_duration_seconds

Using the instant query option, we can only see metrics that are still present in the /metrics endpoint. If a target scrape or rule evaluation no longer returns a sample for a previously existing time series, that time series is marked as stale.

Changed to the range option so we can see the kuberay_cluster_provisioned_duration_seconds metric of deleted RayCluster.

I only updated the RayCluster Provisioned Duration table.

Related issue number

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  • Unit tests
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  • This PR is not tested :(

[win5923]

Not working with the RayJob Execution Duration panel. so i didn't change this panel.

Maybe we can switch the table into a time series.

[seanlaii]

I like the idea of using the Range query, so we can see all the data points across the period instead of losing the data when clusters are deleted. This is very useful for monitoring and historical analysis.