AETHER-369 Export Prometheus metrics

Change-Id: I1e06310b17360f99b6aef969e8ecb19bdc96925c
diff --git a/edge-monitoring/requirements.txt b/edge-monitoring/requirements.txt
index 0410a74..d87fc2e 100644
--- a/edge-monitoring/requirements.txt
+++ b/edge-monitoring/requirements.txt
@@ -2,3 +2,4 @@
 requests
 git+git://github.com/sch3m4/pyadb@master#egg=pyadb
 python-daemon
+prometheus-client