Provide a way to configure the metrics exposed on <cluster-master>:9104/cluster-metrics

We use Prometheus to monitor out production in general and MemSQL as part of it.
This answer provided us a way to expose metrics about pipelines status and query throughput:

It is great but returns enormous amount of metrics (50K) and might be overhead on both MemSQL and Prometheus.

It would be good if there will be an option to decide which groups of metrics you want to be exported on the HTTP request level using query parameter.

It is relevant to MemSQL 7.3



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