RFR: metrics: add Prometheus exporter

Erik Helin ehelin at openjdk.java.net
Wed May 12 12:53:36 UTC 2021

Hi all,

please review this patch that adds a Prometheus exporter to the `metrics` package. The Prometheus format for metrics can be seen [here](https://prometheus.io/docs/instrumenting/exposition_formats/#text-format-details). I also added a bunch of unit tests for the exporter.



Commit messages:
 - metrics: add Prometheus exporter

Changes: https://git.openjdk.java.net/skara/pull/1150/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1150&range=00
  Stats: 235 lines in 3 files changed: 233 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/1150.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1150/head:pull/1150

PR: https://git.openjdk.java.net/skara/pull/1150

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