Fixes Grafana config in ingress example

examples/ingress.jsonnet

@@ -10,15 +10,6 @@ local kp =
   {
     _config+:: {
       namespace: 'monitoring',
-    },
-    // Configure External URL's per application
-    alertmanager+:: {
-      alertmanager+: {
-        spec+: {
-          externalUrl: 'http://alertmanager.example.com',
-        },
-      },
-    },
       grafana+:: {
         config+: {
           sections+: {
@@ -28,6 +19,15 @@ local kp =
           },
         },
       },
+    },
+    // Configure External URL's per application
+    alertmanager+:: {
+      alertmanager+: {
+        spec+: {
+          externalUrl: 'http://alertmanager.example.com',
+        },
+      },
+    },
     prometheus+:: {
       prometheus+: {
         spec+: {