- max_instances renamed to max_running
- consider_args parameter:
if True, $max_running of this function with the same arguments can be
running, else:
$max_running of this function, no matter the arguments, can be running
- discard_if_max_running:
if True and there are already the maximum possible number of running
functions running, cancel this task (previous default behavior), else:
Wait for a spot to be free before running