add metrics endpoint

dhcpdns/dhcpinfo/templates/app.py

@@ -258,6 +258,29 @@ def api_status():
         "timestamp": datetime.now().isoformat()
     }
 
+@app.route('/metrics')
+def metrics():
+    """Prometheus Metrics Endpoint für Kea Statistiken"""
+    kea_client = KeaDHCPClient(KEA_CONTROL_AGENT_URL, KEA_SERVICE, KEA_USERNAME, KEA_PASSWORD)
+    stats_response = kea_client.get_statistics()
+    output = []
+    connection_ok, _ = kea_client.test_connection()
+    output.append(f"kea_connection_ok {1 if connection_ok else 0}")
+    # Lease-Anzahl ermitteln
+    lease_response = kea_client.get_all_leases()
+    total_leases = 0
+    if lease_response and lease_response[0].get("result") == 0:
+        lease_data = lease_response[0].get("arguments", {})
+        total_leases = len(lease_data.get("leases", []))
+    output.append(f"kea_total_leases {total_leases}")
+    if stats_response and stats_response[0].get("result") == 0:
+        stats_data = stats_response[0].get("arguments", {})
+        for stat_name, stat_values in stats_data.items():
+            if isinstance(stat_values, list) and len(stat_values) > 0:
+                value = stat_values[0][0]
+                prom_name = stat_name.lower().replace('.', '_').replace('-', '_').replace('[', '_').replace(']', '')
+                output.append(f"kea_{prom_name} {value}")
+    return '\n'.join(output) + '\n', 200, {'Content-Type': 'text/plain; version=0.0.4; charset=utf-8'}
 
 # OpenAPI/Swagger-Konfiguration
 app.config.update({