Is there a function like a ''Sluice" that can control the stream. it's not `throttle`

Akka Libraries
1

Hi all:
temporary close the Outlet when the system pressure is high, and when the pressure reduction, reopen closed Outlet.
such as : Balance has many outlets, it can close some outlets, and reopen them.

2

Individual streams have back pressure built in, are you trying to build a global throttler that temporarily slows down processing due to an external signal like high CPU/memory usage?