Initial backup: 18 monitoring scripts + timers + docs

- 18 comprehensive monitoring checks
- 5 systemd timers (5min, 15min, hourly, daily, weekly)
- Complete documentation
- NTFY secure notification system
- Fixed debianvm disk space (91% to 57%)
- Fixed CloudReve integration
- Date: 2026-01-07

scripts/check-oom.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Check for OOM killer events
+SEND_NTFY="/usr/local/bin/send-ntfy.sh"
+STATE_FILE="/var/run/oom-check.state"
+
+OOM_COUNT=$(dmesg 2>/dev/null | grep -c "killed process" || echo 0)
+LAST_COUNT=0
+[ -f "$STATE_FILE" ] && LAST_COUNT=$(cat "$STATE_FILE" 2>/dev/null || echo 0)
+
+if [ "$OOM_COUNT" -gt "$LAST_COUNT" ]; then
+    NEW_KILLS=$((OOM_COUNT - LAST_COUNT))
+    $SEND_NTFY critical "OOM Killer Active" "🔴 CRITICAL: OOM killed $NEW_KILLS process(es)!" "skull,error"
+fi
+
+echo $OOM_COUNT > "$STATE_FILE"
+logger -t oom-monitor "OOM: $OOM_COUNT kills"