add basic metrics (#966)
* add metrics
* change how counting works
* also replace dots
* check that metrics exist
* rename NullMetrics to nullMetrics
* update go.sum
* register collectors only once
* add tests
* add tests for metrics and fix bugs
* keep old metrics around for test
* properly reset during shutdown
* use the same method as frankenphp
* Revert "keep old metrics around for test"
This reverts commit 1f0df6f6bdaebf32aec346f068d6f42a0b5f4007.
* change to require.NoError
* compile regex only once
* remove name sanitizer
* use require
* parameterize host port because security software sucks
* remove need for renaming workers
* increase number of threads and add tests
* fix where frankenphp configuration was bleeding into later tests
* adds basic docs for metrics
* Add caddy metrics link
Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
* Fix typos
Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
* address feedback
* change comment to be much more "dangerous"
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Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
