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af55362009
Related to #553 ## Problem LXC containers showed inflated memory usage (e.g., 90%+ when actual usage was 50-60%, 96% when actual was 61%) because the code used the raw `mem` value from Proxmox's `/cluster/resources` API endpoint. This value comes from cgroup `memory.current` which includes reclaimable cache and buffers, making memory appear nearly full even when plenty is available. ## Root Cause - **Nodes**: Had sophisticated cache-aware memory calculation with RRD fallbacks - **VMs (qemu)**: Had detailed memory calculation using guest agent meminfo - **LXCs**: Naively used `res.Mem` directly without any cache-aware correction The Proxmox cluster resources API's `mem` field for LXCs includes cache/buffers (from cgroup memory accounting), which should be excluded for accurate "used" memory. ## Solution Implement cache-aware memory calculation for LXC containers by: 1. Adding `GetLXCRRDData()` method to fetch RRD metrics for LXC containers from `/nodes/{node}/lxc/{vmid}/rrddata` 2. Using RRD `memavailable` to calculate actual used memory (total - available) 3. Falling back to RRD `memused` if `memavailable` is not available 4. Only using cluster resources `mem` value as last resort This matches the approach already used for nodes and VMs, providing consistent cache-aware memory reporting across all resource types. ## Changes - Added `GuestRRDPoint` type and `GetLXCRRDData()` method to pkg/proxmox - Added `GetLXCRRDData()` to ClusterClient for cluster-aware operations - Modified LXC memory calculation in `pollPVEInstance()` to use RRD data when available - Added guest memory snapshot recording for LXC containers - Updated test stubs to implement the new interface method ## Testing - Code compiles successfully - Follows the same proven pattern used for nodes and VMs - Includes diagnostic snapshot recording for troubleshooting |
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