Add webui_system_metrics.sh, run each minute from webuiSystemUpdate:
- whole-server snapshot (metrics.json): CPU% + load, memory + swap,
per-mount disk + inodes, network rx/tx rate, docker summary
- capped ring buffer (metrics_history.json, 24h default) for trend charts
- per-app docker stats grouped by compose project (metrics_apps.json)
plus a short per-app history (metrics_apps_history.json) for sparklines
CPU% and network rate use stateful deltas stashed beside the JSON; all
host metrics read from /proc and docker via runFileOp, so it works rootless.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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