Prior to this commit, this exposed a virtualenv stats.export.s.o which is no
longer accessible. Simplifying this to simply export the rrd file in the munin
venv.
This diff allows to:
- remove the obsolete stats.export.s.o virtualenv from munin
- expose the export history_counters.json directly from munin
http://munin.internal.s.o/export/history_counters.json (so far)
Some more work is needed to expose this publicly.
And fix the retrieval of that counter file.
Related T1544