We started manually changing the ceph config, for example, on eqiad:
root@cloudcephosd1001:~# ceph config dump WHO MASK LEVEL OPTION VALUE RO global advanced mon_target_pg_per_osd 100 global basic osd_memory_target 8589934592 global advanced osd_pool_default_pg_autoscale_mode on mon advanced mon_allow_pool_delete false
But that's not anywhere in our config management system, so we should try to
add it to puppet or similar.