add prometheus export

scripts/mac-watcher.service

@@ -1,15 +1,18 @@
 [Unit]
-Description=MAC-Watcher
-After=syslog.target
+Description=MAC Watcher - SNMP MAC table monitor with Prometheus exporter
 After=network.target
+Wants=network.target
 
 [Service]
-RestartSec=2s
-Type=oneshot
+Type=simple
 User=root
 Group=root
-WorkingDirectory=/opt/mac_watcher/
+WorkingDirectory=/opt/mac_watcher
 ExecStart=/usr/bin/python3 /opt/mac_watcher/mac_watcher.py
+Restart=on-failure
+RestartSec=10s
+StandardOutput=journal
+StandardError=journal
 
 [Install]
-WantedBy=multi-user.target 
+WantedBy=multi-user.target