Get the control item renew interval.
This controls how often the client is going to update the throughput usage of itself
and adjust its own throughput share based on the throughput usage of other clients.
In short words, it controls how quickly the shared throughput will reload balanced across different clients.
The allowed min value is 5s. By default, it is 5s.
Get the control item expire interval.
A client may be offline due to various reasons (being shutdown, network issue... ).
This controls how quickly we will detect the client has been offline and hence allow its throughput share to be taken by other clients.
The allowed min value is 2 * controlItemRenewInterval + 1. By default, it is 11s.