You'll notice
Hitting a channel's own spend cap now shows a distinct message from hitting the general monthly limit
What
The message shown when a spend cap is hit now distinguishes a channel-scoped cap from the general one. Hitting a channel's own monthly limit now shows "You've hit your channel's monthly spend limit," separate from the existing "You've hit your monthly spend limit" message.
Why
This makes it clear whether the limit that was hit applies to a specific channel or to the account as a whole, which matters for knowing who to ask about raising it.