Carriage return/line feed characters, i.e. '\r\n'.
The log timestamp converted to the default date format, e.g. 'Mon Aug 07 2017'.
The log timestamp converted to locale-specific date/time format, e.g. '07/08/2017, 15:53:34'.
The logged error (if any), formatted according to AppenderConfig.errorFormat.
The logged Error's message property.
Note that this placeholder is only valid within AppenderConfig.errorFormat.
The logged Error's name property.
Note that this placeholder is only valid within AppenderConfig.errorFormat.
The logged Error's stack property.
Note that this placeholder is only valid within AppenderConfig.errorFormat.
The log timestamp converted to ISO format, e.g. '2017-08-07T14:53:34.329Z'.
The Level.displayName property.
Linefeed character, i.e. '\n'.
The Logger.name property.
The log message.
The log timestamp converted to locale-specific date format, e.g. '07/08/2017'.
The log timestamp converted to locale-specific time format, e.g. '15:53:34'.
The log timestamp as a number.
The log timestamp converted to UTC format, e.g. 'Mon, 07 Aug 2017 14:53:34 GMT'.
Placeholder constants for use in the AppenderConfig.logFormat and/or AppenderConfig.errorFormat properties.