added rewrite-rules.conf.example

conf/rewrite-rules.conf.example

@@ -0,0 +1,18 @@
+# This file defines regular expression patterns that can be used to
+# rewrite metric names in a search & replace fashion. It consists of two
+# sections, [pre] and [post]. The rules in the pre section are applied to
+# metric names as soon as they are received. The post rules are applied
+# after aggregation has taken place.
+#
+# The general form of each rule is as follows:
+#
+# regex-pattern = replacement-text
+#
+# For example:
+#
+# [post]
+# _sum$ =
+# _avg$ =
+#
+# These rules would strip off a suffix of _sum or _avg from any metric names
+# after aggregation.