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2e1ef44ecd
Squashfs snap mounts on Ubuntu (and similar read-only filesystems like erofs on Home Assistant OS) always report near-full usage and trigger false disk alerts. The filter logic existed in Proxmox monitoring but wasn't applied to host agents. Changes: - Extract read-only filesystem filter to shared pkg/fsfilters package - Apply filter in hostmetrics.collectDisks() for host/docker agents - Apply filter in monitor.ApplyHostReport() for backward compatibility - Convert internal/monitoring/fs_filters.go to wrapper functions This prevents squashfs, erofs, iso9660, cdfs, udf, cramfs, romfs, and saturated overlay filesystems from generating alerts. Filtering happens at both collection time (agents) and ingestion time (server) to ensure older agents don't cause false alerts until they're updated.