When we migrated this to ansible I missed that we didn't bring across
the storage-aggregation.conf file.
This has had the unfortunate effect of regressing the xFilesFactor set
for every newly created graphite stat since the migration. This
setting is a percentage (0-1 float) of how much of a "bucket" needs to
be non-null to keep the value when rolling up changes. We want this
to be zero due to the sporadic nature of data (see the original change
I5f416e798e7abedfde776c9571b6fc8cea5f3a33).
This only affected newly created statistics, as graphite doesn't
modify this setting once it creates the whisper file. This probably
helped us overlook this for so long, as longer-existing stats were
operating correctly, but newer were dropping data when zoomed out.
Restore this setting, and double-check it in testinfra for the future.
For simplicity and to get this back to the prior state I will manually
update the on-disk .wsp files to this when this change applies.
Change-Id: I57873403c4ca9783b1851ba83bfba038f4b90715
6cd7433086