server: add metric for connection idle time (#21265) #21301
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cherry-pick #21265 to release-4.0
What problem does this PR solve?
Add a client connection idle time duration metric. such as below:
Then, it will be easy to check the idle connections.
The idle time is calculated from the last finish execution time.
What is changed and how it works?
add metric.
Related changes
Check List
Tests
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Release note