diff --git a/routlin/maintenance.py b/routlin/maintenance.py
index 26da037..d8b11b9 100644
--- a/routlin/maintenance.py
+++ b/routlin/maintenance.py
@@ -34,6 +34,8 @@ import sys
 import logging
 from pathlib import Path
 
+import mod_metrics as metrics
+
 SCRIPT_DIR         = Path(__file__).parent
 CONFIG_FILE        = SCRIPT_DIR / "config.json"
 CACHE_SERVICE_FILE = SCRIPT_DIR / ".ddns-last-service"
@@ -650,5 +652,14 @@ def main():
     rotate_radius_log(cfg.get("_radius", {}))
     refresh_arp_cache(cfg)
 
+    try:
+        with open(CONFIG_FILE) as f:
+            full_cfg = json.load(f)
+        new_metrics = metrics.collect_metrics(full_cfg)
+        if new_metrics:
+            metrics.update_metrics_file(new_metrics)
+    except Exception as e:
+        log.warning(f"DNS metrics collection failed: {e}")
+
 if __name__ == "__main__":
     main()
diff --git a/routlin/mod_metrics.py b/routlin/mod_metrics.py
index fb1a1d3..3984d0d 100644
--- a/routlin/mod_metrics.py
+++ b/routlin/mod_metrics.py
@@ -6,7 +6,9 @@ and accumulates lifetime totals in a JSON file.
 """
 
 import json
+import os
 import re
+import signal
 import subprocess
 import time
 from datetime import datetime
@@ -42,14 +44,13 @@ def collect_metrics(data):
 
     any_running = False
     for vlan in data["vlans"]:
-        svc = shared.vlan_service_name(vlan, validation.derive_interface(vlan, data))
-        result = subprocess.run(
-            ["systemctl", "kill", "--signal=SIGUSR1", svc],
-            capture_output=True, text=True
-        )
-        if result.returncode != 0:
+        pid_file = shared.vlan_pid_file(vlan)
+        try:
+            pid = int(pid_file.read_text().strip())
+            os.kill(pid, signal.SIGUSR1)
+            any_running = True
+        except Exception:
             continue
-        any_running = True
 
     if not any_running:
         print("No dnsmasq instances are running.")