one or more of your domains encountered an unexpected increase in both traffic and server errors

Hello, Got this email from Cloudflare <[email protected]> with subject "Your recent traffic increase & server errors" Body includes Errors during peak traffic made up 56 % of your errors for your top site on 2024-10-11. These errors, combined with the increase in traffic, may indicate that you’ve experienced a surge in traffic that overwhelmed your applications and infrastructure.
Not sure about which site We have dozens of domains in our Cloudflare account, but the email is so vague.