add file control for main log files

templates/config.alloy.erb

@@ -21,7 +21,7 @@ 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"
+      hostname = env("HOSTNAME"),  // Pulls from $HOSTNAME, defaults to "unknown-host"
     }
   }
 }