modificato conf alloy e compose x hostname in grafana

vm1/alloy-config.alloy

@@ -63,10 +63,26 @@ prometheus.exporter.unix "host" {
   rootfs_path = "/host/root"
 }
 
+// Relabel configuration for Prometheus metrics
+prometheus.relabel "host_metrics" {
+  forward_to = [prometheus.remote_write.mimir.receiver]
+
+  rule {
+    source_labels = ["__address__"]
+    target_label  = "instance"
+    replacement   = "vm1"
+  }
+
+  rule {
+    target_label  = "hostname"
+    replacement   = "vm1"
+  }
+}
+
 // Scrape metrics from the unix exporter
 prometheus.scrape "host" {
   targets    = prometheus.exporter.unix.host.targets
-  forward_to = [prometheus.remote_write.mimir.receiver]
+  forward_to = [prometheus.relabel.host_metrics.receiver]
 }
 
 // Write metrics to Mimir/Prometheus

vm1/docker-compose.yml

@@ -146,6 +146,7 @@ services:
     restart: unless-stopped
     environment:
       TZ: Europe/Rome
+      HOSTNAME: vm1
     volumes:
       - ./alloy-config.alloy:/etc/alloy/config.alloy:ro
       - /var/run/docker.sock:/var/run/docker.sock:ro
@@ -163,6 +164,8 @@ services:
       - "12345:12345" # Alloy UI
     networks:
       - app-network
+    labels:
+      hostname: "vm1"
 networks:
   app-network:
 volumes: