Add documentation for query insights - query metrics feature

[deshsidd]

Description

Add documentation for query insights - query metrics feature : https://github.com/opensearch-project/OpenSearch/issues/11596

Issues Resolved

resolves: https://github.com/opensearch-project/documentation-website/issues/7798

Version

2.16

Checklist

• [x] By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin. For more information on following Developer Certificate of Origin and signing off your commits, please check here.

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[deshsidd]

@hdhalter Please review

[hdhalter]

Thanks so much, @deshsidd ! I'll assign it to @kolchfa-aws for a doc review. In the meantime, can you please review the Vale errors to see if you can address them? Thanks!

[deshsidd]

Thanks so much, @deshsidd ! I'll assign it to @kolchfa-aws for a doc review. In the meantime, can you please review the Vale errors to see if you can address them? Thanks!

Done!

[kolchfa-aws]

@deshsidd I rewrote and pushed to this PR. Could you make sure I preserved technical accuracy of the content? Also, one question:

• Is grpc the actual setting name for a gRPC exporter? And how does the user configure this exporter?