[ceph-users] pg_autoscaler on cache will not work

I activated autoscaler on all my pools but found this error msg when it came to the cache_pool. ceph-mgr.pve22.log.3:2020-05-01 23:59:24.014 7f5120eda700 0 mgr[pg_autoscaler] pg_num adjustment on cache_pool to 512 failed: (-1, '', 'splits in cache pools must be followed by scrubs and leave sufficient free space to avoid overfilling. use --yes-i-really-mean-it to force.') I ended up clearing the cache pool by limiting it to max 1 object and increasing the pg_num/pgp_num. Now I expect the scrub to being every 24h automatically. Should this be included in the docs? Is this a bug of pg_autoscaler ? BR, Alex