id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12369	In boost::log, how to print extra header line when file rotation/rollover	xinyan.zhang@…	Andrey Semashev	"I have an extra header line to be written to log file (csv format). It has a special format. How to write this header line every time when log file is rotated/rollover? Thank you.
My code is like: 

   	const char *logHeaders = ""timestamp,thread,client,message"";
    ...

    boost::shared_ptr< sinks::text_file_backend > backend =
	boost::make_shared< sinks::text_file_backend >(
			logging::keywords::file_name = ""myfile_%5N.csv""
		    logging::keywords::rotation_size = 5 * 1024 * 1024,
			logging::keywords::time_based_rotation = sinks::file::rotation_at_time_point(12, 0, 0),
			);"	Support Requests	closed	To Be Determined	log	Boost 1.61.0	Problem	invalid