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a406fe42d8
Proxmox VE 9.x removed support for the 'ds' parameter in RRD endpoints
(/nodes/{node}/rrddata and /nodes/{node}/lxc/{vmid}/rrddata). When Pulse
sent RRD requests with ds=memused,memavailable,etc., Proxmox responded with:
API error 400: {"errors":{"ds":"property is not defined in schema..."}}
This caused cluster nodes to be repeatedly marked unhealthy, which cascaded
into storage polling failures showing 'All cluster endpoints are unhealthy'
even though the nodes were actually healthy and reachable.
Changes:
- Added check in cluster_client.go executeWithFailover to recognize the ds
parameter error as a capability issue rather than node health failure
- Nodes with this error no longer get marked unhealthy
- Storage polling and other operations now succeed even when RRD calls fail
- The RRD data will be unavailable but core monitoring continues
This fix maintains backward compatibility with older Proxmox versions while
gracefully handling the API change in Proxmox 9.x.