Constant DRAIN_MAX_LOG_WAIT 

pub(crate) const DRAIN_MAX_LOG_WAIT: Duration;

Upper bound for the time the exit files and the attach drains wait for the log drivers to take the output after the process exited, which does not count as a pause of the output, see SharedContainerAttach::logging and Drain::recv_attach, and for the read loops to end once stopped and the log to sync, see ReapableChild::finish_output. A log driver which is slow, like a journal which takes only part of every chunk in time, or which hangs, like a log file on a stuck disk, must not keep the exit from being reported for minutes.