Improvements

Rook v1.5.3 is a patch release limited in scope and focusing on small feature additions and bug fixes.

Ceph

• Buckets from OBCs were being deleted when upgrading from v1.5.1 to v1.5.2. The related change was reverted, with bucket handling delayed until the next release. (#6767, @BlaineEXE)
• Adding a new node to the cluster was not automatically triggering adding of new OSDs (#6768, @shaas)
• Ability to set the prometheus port for external clusters (#6714, @leseb)
• Fix cleanupPolicy schema error in the cluster.yaml example (#6763, @leseb)