If the value is not 1.0, modifies the "retry-after" calculation that occurs when the front-end throttle queue is full.
Default: 1.0
A value of 0 makes the result of the calculation 0. A value of 1.0 keeps the calculation as it is. Any value higher than 1.0 makes the retry-after value larger by that factor. Floating point values are allowed.
Note: New in version 6.1.
