Add default_metric label

This metric will be used to expose metrics gathered from logs

Introduce system/init.yml which will store system wide params

Change-Id: Ieb3ef83ace82f6f3f1b6a6772b309bc89442705f
diff --git a/init.yml b/init.yml
new file mode 100644
index 0000000..7d8695f
--- /dev/null
+++ b/init.yml
@@ -0,0 +1,3 @@
+parameters:
+  _param:
+    dollarsign: '$'