Update rate limit documentation


Looks like we can’t reply to API Announements, so making a new thread. The following quote describing the rate limits should probably be updated to reflect the recently-announced increase in the “certificates per registered domain” rate limit:

If you’ve hit a rate limit, we don’t have a way to temporarily reset it. You’ll need to wait until the rate limit expires after a week. We use a sliding window, so if you issued 10 certificates on Monday and 10 more certificates on Friday, you’ll be able to issue again starting Monday. You can get a list of certificates issued for your registered domain by searching on crt.sh, which uses the public Certificate Transparency logs.


And this:

If you have a lot of subdomains, you may want to combine them into a single certificate, up to a limit of 100 Names per Certificate. Combined with the above limit, that means you can issue certificates containing up to 2,000 unique subdomains per week. A certificate with multiple names is often called a SAN certificate, or sometimes a UCC certificate.

With 50 certificates per week, these are 5000 subdomains per 50 SAN-certificates per week.


Relevant issue: https://github.com/letsencrypt/website/issues/360

Relevant PR: https://github.com/letsencrypt/website/pull/361


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