[Usability] Warning at Ceph cluster on one or zero listener in a subsystem.

[sunilkumarn417]

Please warn user with banner message or status on the Ceph cluster in case of only one or zero listener configured in a subsystem, in which user would understand that failover would be difficult with single Gateway or zero listener.

This would help the user to,

• To have better configuration per subsytem.
• Warns user about unavailability of service during failover, in case of only one or 0 listener.
• helps in monitoring and leads way for better management of subsystem.

[caroav]

@sunilkumarn417 where do you want this warning to show?

[sunilkumarn417]

@caroav It would be good at ceph status level for NVMe GWs, Just like insufficient MDS daemons.