fluentbit: fix unit startup

modules/blocks/monitoring.nix

@@ -629,13 +629,15 @@ in
                 host = "localhost";
                 port = config.services.loki.configuration.server.http_listen_port;
 
-                labels = {
+                labels = lib.traceValSeq (
+                  lib.concatMapAttrsStringSep ", " (n: v: "${n}=${v}") {
                     job = "systemd-journal";
                     domain = cfg.domain;
                     hostname = config.networking.hostName;
-                };
+                  }
+                );
 
-                label_keys = "unit";
+                label_keys = "$unit";
               }
             ];
           };

test/blocks/monitoring.nix

@@ -9,6 +9,9 @@ let
       { ... }:
       [
         "grafana.service"
+        "fluent-bit.service"
+        "loki.service"
+        "netdata.service"
       ];
     waitForPorts =
       { node, ... }: