Prior to this commit, this exposed a virtualenv stats.export.s.o which is no
longer accessible (from munin0 node). Simplifying this to simply export
the rrd file in the munin(0)'s apache venv and expose it through the existing
stats.export.s.o host's front (pergamon).
This diff allows to:
- remove the obsolete stats.export.s.o virtualenv from munin0
- expose the export history_counters.json directly from munin0
http://munin.internal.s.o/export/history_counters.json (so far)
- expose the stats.export.s.o virtualenv in pergamon, proxying
requests to munin.internal.s.o/export/ subfolder
There remains work to renew the certificate use for the fqdn
stats.export.s.o but that's not in the scope of the diff.
Related T1544