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Description of problem:

I am trying PCP 5.0.2 with the all-new Grafana and so far so good, but I have a problem with displaying multiple metrics on a single graph. Say I want to display disk.dev.* all on one graph. If I put this to the query (with the wildcard) it wimply renders two dozens of legends with "vda". Not very useful, when I try to put $metric to the label field I expect the legend to show full metric name, however it simply displays "disk.dev.*" for all legends. There is also quite useful variable $metric0 which is exactly what I want (to display the last element of the metric name), however it displays "*" for all legends again.

I've managed to display "Value" for all legends too, however I am unable to reproduce this with standard metrics only with my own data. Here is the archive, the metric tree in question is:

mmv.fm_rails_activerecord_instances.*

These are counters of some object instances, for some reason PCP instance is not used (this has been fixed with statsd PMDA in PCP5 however I still need to be able to send from old version).

https://lzap.fedorapeople.org/temp/mmv-grafana-labels.tar.xz

Version: 5.0.2-1

Bug is confirmed and fixed in upstream (1.x branch):

commit c178548bb96d823444e3cfcc53d69477e80a2471
Author: Andreas Gerstmayr <agerstmayr>
Date:   Wed Dec 18 12:29:09 2019 +0100

    redis: support wildcards in metric names

Bug is fixed in grafana-pcp 1.0.5-2

Legend "$metric" and "$metric0" works as expected when using grafana-pcp 1.0.5-2 build.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1681