add file control for main log files

templates/config.alloy.erb

@@ -16,6 +16,16 @@ loki.source.file "system_logs" {
   forward_to = [loki.relabel.add_labels.receiver]
 }
 
+// Add hostname as a label explicitly
+loki.process "add_hostname" {
+  forward_to = [loki.relabel.add_labels.receiver]
+  stage.static_labels {
+    values = {
+      hostname = env("HOSTNAME", "unknown-host"),  // Pulls from $HOSTNAME, defaults to "unknown-host"
+    }
+  }
+}
+
 // Add hostname and job labels
 loki.relabel "add_labels" {
   forward_to = [loki.write.loki.receiver]