Support OpenMetrics (was Prometheus exposition format) #113
Description
It would be nice if Boomcatch could expose metrics as Prometheus exposition format / OpenMetrics. This exposition format is supported by many monitoring solutions, like Datadog, Elastic Stack, InfluxDB, (list)... and Prometheus itself which is wildly used in Kubernetes world.
The easiest way to collect those metrics is usually use a instrumentation Client library.