Enable this file observer to use the long output format when logging to stdout. Henceforth, this file observer will use the output format for stdout logging that was set by the most recent call to setLogFormat, or the default long output format ("n%d %p:%t %s %f:%l %c %m %un") if setLogFormat has not yet been called. This method has no effect if the long output format for stdout logging is already enabled.