I'd like to see such metadata labels, though Prometheus purists like to push for
group_left() gymnastics. Which IMHO complicate the heck out of queries.
For other information needed by ceph-exporter to
decorate metrics with
common metadata, I think a new command is warranted. The output format
should be the same for all daemons and the code that would parse it in
ceph-exporter should be daemon-agnostic.