Improvements

Rook v1.6.11 is a patch release limited in scope and focusing on small feature additions and bug fixes to the Ceph operator.

• rgw: Allow reconcile to complete even during a downgrade (#9137, @travisn)
• docs: Add OMAP quick fix warning to the upgrade guide (#9187, @BlaineEXE)
• multus: Do not build all the args to remote exec cmd (#8860, @leseb)
• multus: do not fail on keys deletion (#8868, @leseb)