PG object skew settings

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Hi

Is it safe to tweak the value of `mon pg warn max object skew` from the
default value of 10 to a higher value of 20-30 or so. What would be a
safe upper limit for this value?

Also what does exceeding this ratio signify in terms of the cluster
health? We are sometimes hitting this limit in buckets index pool
(.rgw.buckets.index) which had the some number of pgs compared to a few
other pools which host almost no data like the gc pool, root pool etc.

Cheers!
Abhishek
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