Constant MAX_CONNECTIONS 

const MAX_CONNECTIONS: usize = _; // 256usize

The most connections which did not get upgraded yet. More wait to be accepted, so that local processes which open connections without a request cannot use up the descriptors the whole pod needs. Upgraded connections do not count, their tokens bound them. There is no limit per peer, the server listens on the loopback address only, where the kubelet and a local process which holds connections look the same.