Add Grafana dashboard for Aether subscriber monitor

Change-Id: I60094a940d50cd617534fd12128c4c37a816b404
diff --git a/nem-monitoring/templates/grafana-dashboard-configmap.yaml b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
index 15d89fa..1b361cc 100644
--- a/nem-monitoring/templates/grafana-dashboard-configmap.yaml
+++ b/nem-monitoring/templates/grafana-dashboard-configmap.yaml
@@ -72,3 +72,7 @@
   bng-dashboard.json: |
 {{ .Files.Get "grafana-dashboards/bng-dashboard.json" | indent 4 }}
 {{- end }}
+{{- if .Values.dashboards.aetherMMEExporter }}
+  aether-mme-exporter.json: |
+{{ .Files.Get "grafana-dashboards/aether-mme-exporter.json" | indent 4 }}
+{{- end }}