Puppet fails on CI slaves with:
Notice: /Stage[main]/Ganglia::Monitor::Packages/File[/etc/ganglia/conf.d]/ensure: created Error: Cannot create /usr/lib/ganglia/python_modules; parent directory /usr/lib/ganglia does not exist
That is because ganglia is no more installed, though on old instances /etc/ganglia is still around.
The root cause is that the browser tests virtual host uses apache::site which ends up including apache::monitoring` which include ganglia ...
Same goes with hhvm::monitoring
Looks like we can short circuit it via $::standard::has_ganglia.