diff --git a/nix/host-modules/swarm-grafana/dashboards/egress.json b/nix/host-modules/swarm-grafana/dashboards/egress.json
index e21f9e46..c5447d8c 100644
--- a/nix/host-modules/swarm-grafana/dashboards/egress.json
+++ b/nix/host-modules/swarm-grafana/dashboards/egress.json
@@ -798,17 +798,13 @@
               ],
               "transformations": [
                 {
-                  "kind": "labelsToFields",
+                  "kind": "joinByLabels",
                   "spec": {
-                    "id": "labelsToFields",
-                    "options": {}
-                  }
-                },
-                {
-                  "kind": "merge",
-                  "spec": {
-                    "id": "merge",
-                    "options": {}
+                    "id": "joinByLabels",
+                    "options": {
+                      "join": ["dest"],
+                      "value": "__name__"
+                    }
                   }
                 },
                 {
@@ -1038,17 +1034,13 @@
               ],
               "transformations": [
                 {
-                  "kind": "labelsToFields",
+                  "kind": "joinByLabels",
                   "spec": {
-                    "id": "labelsToFields",
-                    "options": {}
-                  }
-                },
-                {
-                  "kind": "merge",
-                  "spec": {
-                    "id": "merge",
-                    "options": {}
+                    "id": "joinByLabels",
+                    "options": {
+                      "join": ["agent", "dest"],
+                      "value": "__name__"
+                    }
                   }
                 },
                 {
@@ -1407,17 +1399,13 @@
               ],
               "transformations": [
                 {
-                  "kind": "labelsToFields",
+                  "kind": "joinByLabels",
                   "spec": {
-                    "id": "labelsToFields",
-                    "options": {}
-                  }
-                },
-                {
-                  "kind": "merge",
-                  "spec": {
-                    "id": "merge",
-                    "options": {}
+                    "id": "joinByLabels",
+                    "options": {
+                      "join": ["agent", "dest", "port"],
+                      "value": "__name__"
+                    }
                   }
                 },
                 {
diff --git a/nix/module-eval/grafana.nix b/nix/module-eval/grafana.nix
index ada37531..b4f95f9f 100644
--- a/nix/module-eval/grafana.nix
+++ b/nix/module-eval/grafana.nix
@@ -496,15 +496,20 @@ let
         && lib.all (e: lib.hasInfix "\"TCP_\"*" e) (
           lib.filter (e: lib.hasInfix access e) (exprs ++ [ agentVar.spec.query.spec.query ])
         )
-        # A grouped stats query is one frame per group, which a table panel shows as
-        # a dropdown of series; labels to columns, then a merge, makes the rows.
+        # A grouped stats query is one frame per group and stat, which a table panel
+        # shows as a dropdown of series; joining by the group labels, with the stat's
+        # name as the column, makes one row per group.
         && lib.all (
           e:
-          map (t: t.spec.id) e.spec.data.spec.transformations == [
-            "labelsToFields"
-            "merge"
+          let
+            xf = e.spec.data.spec.transformations;
+          in
+          map (t: t.spec.id) xf == [
+            "joinByLabels"
             "organize"
           ]
+          && (lib.head xf).spec.options.value == "__name__"
+          && (lib.head xf).spec.options.join != [ ]
         ) (lib.filter (e: e.spec.vizConfig.group == "table") (lib.attrValues board.spec.elements))
         && lib.hasInfix "logformat would_deny would_deny user=%[un method=%rm host=%>rd port=%>rP result=" squid
         && lib.hasInfix "access_log syslog:daemon.info squid !manager" squid;