Upgrade prometheus from 2.6.0 to 2.23.0 #187
Merged
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So, so many new features and enhancements in the last two years...
https://github.com/prometheus/prometheus/blob/master/CHANGELOG.md
In particular, newer versions of prometheus support PromQL subqueries,
which make querying the metrics that router emits much cleaner.
We don't really use our prometheus all that much, so I think this is
fine to just ship-it-and-see.