Add logger filter example
[logger]
-# The Logger level
-# Valid values: trace, debug, info, warn, error
-level = "debug"
+# The Logger level filter
+# Example of a valid filter: "warn,tornado=info,rants=debug"
+# ^ ^ ^
+# | | logger level of the 'rants' library (Nats client library)
+# | logger level of 'tornado'
+# global logger level
+level = "info,tornado=debug"
# Whether the Logger should print to standard output.
# Valid values: true, false
