Add a prometheus exporter

Change-Id: I2989d87c2a83eed31c6617694bdcb78bf9b38553
diff --git a/lib/deps.json b/lib/deps.json
index 6a52650..a5bd894 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -179,6 +179,10 @@
     "httpclient-osgi": "mvn:org.apache.httpcomponents:httpclient-osgi:4.5.1",
     "httpcore-osgi": "mvn:org.apache.httpcomponents:httpcore-osgi:4.4.4",
     "influxdb-java": "mvn:org.influxdb:influxdb-java:2.9",
+    "simpleclient": "mvn:io.prometheus:simpleclient:0.5.0",
+    "simpleclient_common": "mvn:io.prometheus:simpleclient_common:0.5.0",
+    "simpleclient_hotspot": "mvn:io.prometheus:simpleclient_hotspot:0.5.0",
+    "simpleclient_servlet": "mvn:io.prometheus:simpleclient_servlet:0.5.0",
     "retrofit": "mvn:com.squareup.retrofit2:retrofit:2.3.0",
     "converter-moshi": "mvn:com.squareup.retrofit2:converter-moshi:2.3.0",
     "okhttp": "mvn:com.squareup.okhttp3:okhttp:3.9.1",
@@ -210,6 +214,8 @@
     "jetty-util": "mvn:org.eclipse.jetty:jetty-util:9.2.21.v20170120",
     "jetty-websocket": "mvn:org.eclipse.jetty:jetty-websocket:8.1.19.v20160209",
     "jetty-server": "mvn:org.eclipse.jetty:jetty-server:9.2.21.v20170120",
+    "jetty-servlet": "mvn:org.eclipse.jetty:jetty-servlet:9.2.26.v20180806",
+    "jetty-security": "mvn:org.eclipse.jetty:jetty-security:9.2.21.v20170120",
     "jetty-continuation": "mvn:org.eclipse.jetty:jetty-continuation:9.2.21.v20170120",
     "jetty-http": "mvn:org.eclipse.jetty:jetty-http:9.2.21.v20170120",
     "jetty-io": "mvn:org.eclipse.jetty:jetty-io:9.2.21.v20170120",