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1dc19bfec0
Recorded PVE 8 and PVE 9 guest rrddata responses (fixtures under
pkg/proxmox/testdata/rrd/) prove guest RRD never carries the cache-aware
memused/memavailable columns — they exist only in node RRD — so every
consumer branch reading them was dead code that #1634's listing fallback
(7d7d2b6a3) had already routed around.
Drop the two fields from GuestRRDPoint (now time/maxmem only, matching
the recordings), delete the dead VM RRD memory fallback and its
getVMRRDMetrics/getVMRRDMemory helpers plus the vmRRDMemCache they fed,
remove the pointless per-poll guest RRD fetch from the LXC memory path,
and retire the guest RRD lookups from PVEClientInterface. VMMemoryRaw
loses its never-populated RRD diagnostic fields, and guest reliability
scoring no longer treats the node-only rrd-* sources as trusted guest
evidence. The knownDeadGuestRRDFields allowlist in the fixture
alignment test is gone; a new reflection guard in
code_standards_test.go keeps GuestRRDPoint pinned to recorded columns,
and cleanupRRDCache pruning of the guest-agent meminfo cache gains
direct coverage.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>