Provide 'cooldown' period configuration to mitigate aggressive scale-up

[hungwunfai]

The throttle triggered scale-up is often too aggressive, due to a lag between capacity being set and actual throttle going away. It would be extremely helpful to have a cooldown period configuration that defines how long to wait after a scale-up or scale-down action before another one.

[ninjada]

+1, especially on downscales, with the 4x per day limit.

Any cost gains im making can be wiped out pretty quickly.