metrics: rework prometheus integration #2356
Merged
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The peers_total metric used to live deep down in libp2p,
it is now nicely separated, and there's space for even
more metrics. Tests are a good thing too.
The Prometheus library is now gx'ed too. I pinned it on biham.
License: MIT
Signed-off-by: Lars Gierth larsg@systemli.org