siv_throttle_cache_size — set the maximum number of named throttles
siv_throttle_cache_size = 1000
This option sets the maximum number of named throttles created by Lua scripts. If you try to create more throttles than this value, throttles created earlier will be destroyed.
The default value is
1000 (because Adaptive Delivery makes heavy use of throttles).
siv_throttle_cache_size is valid in the global scope.