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KumoMTA maintains a pool of lua contexts so that the overhead of evaluating lua for any given event handler is reduced.

This function allows you to change the maximum capacity of that pool.

The default value is 8192.

Make it smaller reduces the amount of memory used while idle, at the cost of increased latency when the server becomes busy.

See also set_max_lua_context_use_count, set_max_lua_context_age.