Add prometheus plugin on fluentd image.

cluster/addons/fluentd-elasticsearch/fluentd-es-image/build.sh

@@ -32,6 +32,7 @@ sed -i -e "s/USER=td-agent/USER=root/" -e "s/GROUP=td-agent/GROUP=root/" /etc/in
 # http://docs.fluentd.org/articles/plugin-management
 td-agent-gem install --no-document fluent-plugin-kubernetes_metadata_filter -v 0.27.0
 td-agent-gem install --no-document fluent-plugin-elasticsearch -v 1.9.5
+td-agent-gem install --no-document fluent-plugin-prometheus -v 0.3.0
 
 # Remove docs and postgres references
 rm -rf /opt/td-agent/embedded/share/doc \

cluster/addons/fluentd-elasticsearch/fluentd-es-image/td-agent.conf

@@ -283,6 +283,44 @@
   type kubernetes_metadata
 </filter>
 
+# Prometheus Exporter Plugin
+# input plugin that exports metrics
+<source>
+  type prometheus
+</source>
+
+<source>
+  type monitor_agent
+</source>
+
+<source>
+  type forward
+</source>
+
+# input plugin that collects metrics from MonitorAgent
+<source>
+  @type prometheus_monitor
+  <labels>
+    host ${hostname}
+  </labels>
+</source>
+
+# input plugin that collects metrics for output plugin
+<source>
+  @type prometheus_output_monitor
+  <labels>
+    host ${hostname}
+  </labels>
+</source>
+
+# input plugin that collects metrics for in_tail plugin
+<source>
+  @type prometheus_tail_monitor
+  <labels>
+    host ${hostname}
+  </labels>
+</source>
+
 <match **>
    type elasticsearch
    log_level info