Add Grafana dashboard for Aether subscriber monitor

Change-Id: I60094a940d50cd617534fd12128c4c37a816b404
diff --git a/nem-monitoring/values.yaml b/nem-monitoring/values.yaml
index 5b5a6c3..c978404 100644
--- a/nem-monitoring/values.yaml
+++ b/nem-monitoring/values.yaml
@@ -104,4 +104,5 @@
   aetherEdges: false
   aetherCentralPods: false
   aetherEdgePods: false
+  aetherMMEExporter: false
   bng: false