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Enable pg_autoscaler module:

ceph mgr module enable pg_autoscaler

check:

ceph mgr module ls

Then enable pg_autoscale for a specific pool:

ceph osd pool set ${POOL_NAME} pg_autoscale_mode on

For all pools:

for POOL_NAME in $(ceph osd pool ls ) ; do ceph osd pool set ${POOL_NAME} pg_autoscale_mode on ; done