Improvements

Rook v1.9.1 is a patch release limited in scope and focusing on feature additions and bug fixes to the Ceph operator.

• monitoring: Disable new alerts that are not applicable to rook (#10109, @travisn)
• core: Examples set default priority class names (#10096, @travisn)
• nfs: use k8s.gcr.io for csi nfsplugin image (#10059, @Madhu-1)
• csi: Add CSI encryption support (#9940, @Rakshith-R)
• csi: Make GRPC timeout configurable (#10074, @Madhu-1)
• helm: Add missing default resources in rook components (#10089, @yuvalman)
• osd: Enable Quincy osd release version (#10088, @travisn)
• core: Update controller-runtime version to v0.11.2 (#10023, @subhamkrai)
• block: Validate name updates to the BlockPool CR (#10099, @Madhu-1)
• helm: Add ingressClassName field (#10093, @log1cb0mb)
• csi: Enable csi nfs to generate nfs rbac for csv (#10071, @Rakshith-R)
• docs: Update NFS docs including latest CSI work (#10014, @BlaineEXE)
• build: Generate a separate NFS CSI RBAC manifest (#10058, @BlaineEXE)
• docs: Add info about mounting NFS exports externally (#10078, @BlaineEXE)
• csi: Add nfs nodeplugin & provisioner (#9927, @Rakshith-R)
• build: update golang version to v1.17 (#10094, @subhamkrai)
• build: Add a placeholder rgw role for csv generation (#10108, @travisn)
• subvolumegroup: Refactor subvolumegroup controller (#10111, @Madhu-1)