monitoring: scrape titan-db node_exporter

services/monitoring/helmrelease.yaml

@@ -186,6 +186,15 @@ spec:
                 - targets: ["longhorn-backend.longhorn-system.svc:9500"]
               metrics_path: /metrics
 
+            # --- titan-db node_exporter (external control-plane DB host) ---
+            - job_name: "titan-db"
+              static_configs:
+                - targets: ["192.168.22.10:9100"]
+              relabel_configs:
+                - source_labels: [__address__]
+                  target_label: instance
+                  replacement: titan-db
+
             # --- cert-manager (pods expose on 9402) ---
             - job_name: "cert-manager"
               kubernetes_sd_configs: [{ role: pod }]