Added explainations on how having a working configuration for Prometheus (#4397)
Added explainations on how having a working configuration for Prometheus (#4397)

* Added explainations on how having a working configuration for Prometheus

Since Prometheus escapes by default query parameters, this paragraph explains
how having `format=prometheus` to be taken into account by prometheus.

* Rephrase Prometheus notes in documentation as requested by @pearkes

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