Update changelog

(cherry picked from commit f7a4d20bbb7f7eaa6278bbcee5c62eeeb53d8cc7)

etc/telegraf.conf

@@ -3834,6 +3834,15 @@
 #
 #   ## List of interfaces to ignore when pulling metrics.
 #   # interface_exclude = ["eth1"]
+#
+#   ## Some drivers declare statistics with extra whitespace, different spacing,
+#   ## and mix cases. This list, when enabled, can be used to clean the keys.
+#   ## Here are the current possible normalizations:
+#   ##  * snakecase: converts fooBarBaz to foo_bar_baz
+#   ##  * trim: removes leading and trailing whitespace
+#   ##  * lower: changes all capitalized letters to lowercase
+#   ##  * underscore: replaces spaces with underscores
+#   # normalize_keys = ["snakecase", "trim", "lower", "underscore"]
 
 
 # # Read metrics from one or more commands that can output to stdout