Francois Tur f9bdd382dd Ensure Re-register of metrics variables after a reload (#2080) ...

* - ensure plugins that use prometheus.MustRegister, re-register after reload
- removing once.Do on the startup function was simplest way to do it.

* - fix underscored names (advice of bot)

* - tune existing UT for reload, and add a test verifying failing reload does not prevent correct registering for metrics

* - ensure different ports for tests that can run in same time ..

2018-09-19 02:11:24 -07:00

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