know(With client-side load balancing, the client knows about endpoints. — При использовании балансировки нагрузки на стороне клиента, клиент осведомлён о конечных точках.Alex_Odeychuk)
have one's finger on the pulse(в какой-либо области; Sara really has her finger on the pulse of nightlife in the city, so I would ask her where you should have your birthday party. Alexsword92)