Mention server_metrics() and data_metrics() in FAQ How to get notified when the server state changes

[SteveLauC]

What kind of doc do you ask for?

• Code comments.
• Architecture design.
• Algorithm explanation.
• Guide.
• Examples.

Describe the information you want

server_metrics() and data_metrics() should be mentioned in FAQ: How to get notified when the server state changes? as it will help a lot if people are only interested in server state metrics, not the data ones.

Describe the status of the current doc

• Is there any doc yet?:

Yes, but only the metrics() API.

• What other information should be added?

A brief mention of server_metrics() and data_metrics().

• I'll open a pull request for it:)

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