message: Keep raw nginx log message
  We parse the nginx log message into the relevant fields, but some users
  may want the original log message.
diff: @@ -171,16 +171,11 @@ data:
  </pattern>
  </parse>
  </filter>
  - # remove the redundant "log" field if the record was successfully parsed
  # some container logs have a duplicate message field for some reason, so
  - # remove that too.
  + # remove that.
  <filter lagoon.*.container>
  @type record_modifier
  - remove_keys _dummy_,message
  - <record>
  - # check for nginxy fields
  - _dummy_ ${if %w(http_x_forwarded_for referer agent).all?{|key| record[key]}; record.delete("log"); end; nil}
  - </record>
  + remove_keys message
  </filter>
  #
  