add the ansible playbooks for the monitoring stack

ansible/roles/grafana/templates/datasources.yml.j2

@@ -0,0 +1,34 @@
+apiVersion: 1
+
+datasources:
+  # Local Prometheus (RPi - infrastructure metrics)
+  - name: Prometheus-Infra
+    type: prometheus
+    access: proxy
+    url: http://localhost:9090
+    isDefault: true
+    editable: false
+    jsonData:
+      timeInterval: "30s"
+      httpMethod: POST
+
+  # Cluster Prometheus (Talos - Kubernetes metrics)
+  - name: Prometheus-Cluster
+    type: prometheus
+    access: proxy
+    url: {{ prometheus_cluster_url }}
+    isDefault: false
+    editable: false
+    jsonData:
+      timeInterval: "30s"
+      httpMethod: POST
+
+  # Loki (Talos cluster - centralized logs)
+  - name: Loki
+    type: loki
+    access: proxy
+    url: {{ loki_url }}
+    isDefault: false
+    editable: false
+    jsonData:
+      maxLines: 1000