Whether to write/send access_log records ASAP or accumulate them and
then write/send them in larger chunks. Buffering may improve
performance because it decreases the number of I/Os. However,
buffering increases the delay before log records become available to
the final recipient (e.g., a disk file or logging daemon) and,
hence, increases the risk of log records loss.
Note that even when buffered_logs are off, Squid may have to buffer
records if it cannot write/send them immediately due to pending I/Os
(e.g., the I/O writing the previous log record) or connectivity loss.
Currently honored by 'daemon', 'tcp' and 'udp' access_log modules only.