[Feature] [Status API] Cluster coordinator status API.

[wu-sheng]

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• I had searched in the issues and found no similar feature requirement.

Description

Cluster coordinator has a discovery list of every OAP node.
We could add a restful cluster node list API.

It outputs

1. The number of discovered oap nodes
2. List all nodes
3. Flag the self node.

Use case

No response

Related issues

With this information, we could tell whether cluster coordinator runs as expected by manual check.

We could add an extra segment of cluster management called check cluster scale to use this API to check that.

Are you willing to submit a pull request to implement this on your own?

• Yes I am willing to submit a pull request on my own!

Code of Conduct

• I agree to follow this project's Code of Conduct