Set labels for victoria* metrics

modules/system/services/alloy.nix

@@ -76,6 +76,8 @@ in
           prometheus.scrape "victorialogs" {
             targets = [{
               __address__ = "localhost:${builtins.toString config.custom.services.victorialogs.port}",
+              job         = "victorialogs",
+              instance    = constants.hostname,
             }]
             forward_to      = [prometheus.remote_write.default.receiver]
             scrape_interval = "15s"

modules/system/services/victoriametrics.nix

@@ -50,7 +50,11 @@ in
         }
       );
       listenAddress = "localhost:${builtins.toString cfg.port}";
-      extraOptions = [ "-selfScrapeInterval=15s" ];
+      extraOptions = [
+        "-selfScrapeInterval=15s"
+        "-selfScrapeJob=victoriametrics"
+        "-selfScrapeInstance=${config.networking.hostName}"
+      ];
     };
 
     custom.persist.directories = [ "/var/lib/${config.services.victoriametrics.stateDir}" ];