Most arguments in one call.
Idle time before a session expires; active operations postpone expiry.
Groups open at once; further opens are refused.
Initial accessible canonical backing admission; trusted bindings enforce growth maxima.
Largest single memory read.
Largest request body.
Largest response body.
Sessions whose last response the host keeps for retryPending().
Workers a single session may request.
Largest single memory write.
Admission and transport bounds. Defaults are conservative for a shared host.