📖What it is

Tracks each worker's cost and flags overspending mid-task.

This keeps a meter on how much each worker spends as it works, in one consistent way. If a job starts running over budget partway through, it flags it. Every working helper is metered by it.

🔌Who calls it (4)

Worked out from who actually calls it, not from a note somebody wrote.

🧮Other monitoring accountability machinery