feat(connection): conn metric for rule

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 71.17%. Comparing base (0d5c110) to head (e685d68). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3173 +/- ## ========================================== + Coverage 71.13% 71.17% +0.04% ========================================== Files 386 386 Lines 43210 43265 +55 ========================================== + Hits 30736 30791 +55 - Misses 10041 10044 +3 + Partials 2433 2430 -3 ```

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