Ceph » Orchestrator

Basic information about mirroring being enabled is collected for Ceph RBD. Since CephFS mirroring is a feature, it would be good to also collect that. The Rook project is interested in collecting this telemetry, and I imagine it is useful for cephadm as well.

An example of the "rbd" section in today's Ceph telemetry shows that "mirroring_by_pool" is a simple boolean list to show how many pools have mirroring enabled.

"rbd": {
            "mirroring_by_pool": [
                false
            ],
            "num_images_by_pool": [
                0
            ],
            "num_pools": 1
        },

Can something similar be implemented for CephFS? I have suggested a format that might work below:

"fs": {
            "count": 1,
            "feature_flags": {
                "enable_multiple": true,
                "ever_enabled_multiple": true
            },
            "filesystems": [
        {
                    "approx_ctime": "2022-05",
                    "balancer_enabled": false,
                    "bytes": 0,
                    "cached_caps": 0,
                    "cached_dns": 10,
                    "cached_inos": 16,
                    "cached_subtrees": 4,
                    "ever_allowed_features": 32,
                    "explicitly_allowed_features": 32,
                    "files": 0,
                    "max_mds": 1,
                    "mirroring_enabled": 1,   # <---- add this?
                    "num_data_pools": 1,
                    "num_in": 1,
                    "num_mds": 2,
                    "num_sessions": 0,
                    "num_standby_replay": 1,
                    "num_up": 1,
                    "snaps": 0,
                    "standby_count_wanted": 1
                }
            ],
            "num_standby_mds": 0,
            "total_num_mds": 2
        },

It would be nice to have this backported to Quincy.