Disable object skew warnings

Ceph will issue a HEALTH_WARN in the event that one pool has a
large number of objects compared to other pools in the cluster:

 "Issue a HEALTH_WARN in cluster log if the average object
  number of a certain pool is greater than mon pg warn max
  object skew times the average object number of the whole
  pool."

For OpenStack deployments, Gnocchi and RADOS gateway can generate
a large number of small objects compared to Cinder, Glance and
Nova usage, causing the cluster to go into HEALTH_WARN status.

Disable this check until the skew evaluation also includes the
size of the objects as well as the number.

Change-Id: I83211dbdec4dea8dca5b27a66e26a4431d2a7b77
Closes-Bug: 1804846

templates/ceph.conf

@@ -17,6 +17,12 @@ mon cluster log to syslog = {{ use_syslog }}
 debug mon = {{ loglevel }}/5
 debug osd = {{ loglevel }}/5
 
+# NOTE(jamespage):
+# Disable object skew warnings as these only use
+# the number of objects and not their size in the
+# skew calculation.
+mon pg warn max object skew = -1
+
 {% if ceph_public_network is string %}
 public network = {{ ceph_public_network }}
 {%- endif %}