One number: the dollars tied to accounts showing a risk signal, with the breakdown underneath. An overdue invoice, an email thread that turned cold, or a project that stopped moving each pull an account's open value into the total.
Everything here lives on a board with the Pulse above it: the line that reads the whole board and says what changed, what needs attention, and what to do next.
Edit the wording until it fits your business exactly. Two ways businesses bend this one: