How to log or see a list of caused 52x errors?

Hello,

i’ve been looking for a while when my site is getting 52x errors.
A while ago, i have discovered a page on Cloudflare.com where i can see how many 52x erros there called on my domains in 24 hours. But now i don’t remember it.

Can somebody tell me where i can find this page?

And a bonus-question:
Can i use the 52x-errors reports in the Cloudflare API?