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# What is CPU Throttle?

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Mike Post (@mpost-hai) · 2024-12-30

We enabled the Observability Plus add-on today and now we can see a graph labeled "CPU Throttle" with durations on Y-axis and timestamps on the X-axis. What is actual definition of CPU Throttle used by this chart? (This is under Observability -> Serverless Functions -> Advanced metrics.) I can't seem to find it anywhere. It's definitely not "were your functions throttled and returning 429s" because that under Usage shows zero data.


John Privyio (@john-privy) · 2025-05-16

Bump - curious for the answer to this one! This blog post talks about it but does not explain what it is:

https://vercel.com/changelog/view-advanced-function-metrics-with-observability