We have just released 8.4.1 of the v8-stable branch.
This is primarily a bug-fixing release, but provides one small enhancement, the so-called "bracketing mode" of impstats. It tells impstats to emit begin and end message before and after emitting stats.
Please note that this releases also fixes a potential remote DoS, which may happen for some (non-default) configurations. As such, users are highly encouraged to upgrade to this version.
As always, feedback is appreciated.