StackLight: collect system metrics of the etcd process

Change-Id: I9466c3b84e4eec476ab681d6e1a7c943fa6ee289
diff --git a/etcd/meta/collectd.yml b/etcd/meta/collectd.yml
index df2e5b2..6522147 100644
--- a/etcd/meta/collectd.yml
+++ b/etcd/meta/collectd.yml
@@ -4,3 +4,7 @@
       etcd:
         expected_code: 200
         url: http://127.0.0.1:{{ pillar.etcd.server.get('port', '4001') }}/health
+  collectd_processes:
+    process:
+      etcd:
+        match: etcd$