v2.1: Update metrics & ema before breaking the connection loop (backport of #4414) #4450
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Problem
It is found that active_streams is none zero even after no connections to the server. This is due to we missed updating metrics in case of connection error when handling chunks.
Summary of Changes
Update metrics and ema before break conn loop.
Fixes #
This is an automatic backport of pull request #4414 done by [Mergify](https://mergify.com).