Feature: A new command, `ceph osd rm-pg-upmap-primary-all`, has been added that allows users to clear all pg-upmap-primary mappings in the osdmap when desired. As with the existing command `ceph osd rm-pg-upmap-primary <pgid>`, this new command should be used with caution, as it directly modifies primary PG mappings and can impact read performance (this excludes any data movement). Reason: Users who want to remove all pg-upmap-primary mappings may do so more easily now with one command. This command may also be used to remove invalid mappings left over from a bug where pg-upmap-primary entries were left in the osdmap after users deleted a pool. Result: If a user has pg-upmap-primary mappings in their osdmap, the expected result after running the new command should be that all pg-upmap-primary mappings have been removed from the cluster. This includes valid and invalid pg-upmap-primary mappings.