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-tailscale.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Monitor Tailscale VPN connectivity
+set -euo pipefail
+
+SEND_NTFY="/usr/local/bin/send-ntfy.sh"
+
+# Check if Tailscale is running
+if ! systemctl is-active --quiet tailscaled; then
+    $SEND_NTFY critical "Tailscale Down" "🔴 CRITICAL: Tailscale service is NOT RUNNING on PVE! Remote access unavailable." "skull,error,globe_with_meridians"
+    exit 1
+fi
+
+# Check Tailscale status
+TS_STATUS=$(timeout 10 tailscale status 2>/dev/null || echo "FAILED")
+
+if [ "$TS_STATUS" = "FAILED" ]; then
+    $SEND_NTFY critical "Tailscale Check Failed" "🔴 CRITICAL: Unable to get Tailscale status!" "skull,error"
+    exit 1
+fi
+
+# Check if we're connected to the network
+if echo "$TS_STATUS" | grep -q "100.96.100.82"; then
+    logger -t tailscale-monitor "Tailscale: Connected"
+else
+    $SEND_NTFY warning "Tailscale Disconnected" "🟡 WARNING: Tailscale may be disconnected - cannot find local IP in status" "warning,globe_with_meridians"
+fi
+
+# Check if iMac is reachable via Tailscale (critical for iMacHDD storage)
+IMAC_REACHABLE=$(timeout 5 ping -c 1 anthonys-iMac.kangaroo-eel.ts.net >/dev/null 2>&1 && echo "YES" || echo "NO")
+
+if [ "$IMAC_REACHABLE" = "NO" ]; then
+    $SEND_NTFY warning "iMac Unreachable" "🟡 WARNING: iMac unreachable via Tailscale - iMacHDD storage may be affected" "warning,computer"
+fi
+
+logger -t tailscale-monitor "Tailscale check completed"