You hit the limit and you can't say why.
The work got done. The limit ran out anyway. Maybe it ran out on you before lunch, or one person on your team keeps hitting it while the others sail through the week.
The usual answers are guesses: "use it less," "use a smaller model," "that task must be heavy." Nothing tells you what to actually change, because nothing shows where the usage went.
Watching people work is slow, and people change what they do when they're watched. Asking them to remember is unreliable. The numbers are already sitting inside the session. They just need to be read.