Cathal Mooney 50f766476c Update formatting of Prometheus extension doc (#13291)
* Modified Prometheus extension to allow for a configurable prefix on metric names.

* Added reference in config_definitions.json and updated docs.

* Fixed whitespace in config_definitions.json.

* Added reference to prometheus.prefix in settings.php

* Defined prefix var as private in Prometheus.php

* Formatting changes to doc for Prometheus extension.
2021-09-29 10:04:23 +02:00
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