System.out yyyy-MM-dd'T'HH:mm:ss.SSSXXX time [ignore] message logger thread [ignore] [ignore] stack_trace {"severity":"%replace(%replace(%level){'WARN','WARNING'}){'TRACE','DEBUG'}"} System.err WARN yyyy-MM-dd'T'HH:mm:ss.SSSXXX time [ignore] message logger thread [ignore] [ignore] stack_trace {"severity":"%replace(%replace(%level){'WARN','WARNING'}){'TRACE','DEBUG'}"}