+
+* The maximum number of PGs per OSD before the monitor issues a
+ warning has been reduced from 300 to 200 PGs. 200 is still twice
+ the generally recommended target of 100 PGs per OSD. This limit can
+ be adjusted via the ``mon_max_pg_per_osd`` option on the
+ monitors. The older ``mon_pg_warn_max_per_osd`` option has been removed.
+
+* Creating pools or adjusting pg_num will now fail if the change would
+ make the number of PGs per OSD exceed the configured
+ ``mon_max_pg_per_osd`` limit. The option can be adjusted if it
+ is really necessary to create a pool with more PGs.