Rate Limit Error Message Improvements

We are making incremental changes to the information returned in rate limit messages. Previously, all messages included a link to our full rate limits documentation:

429 urn:ietf:params:acme:error:rateLimited: Error creating new order :: too many certificates already issued for: example.com: see https://letsencrypt.org/docs/rate-limits/

Beginning with the Boulder update on 2022-06-23, some rate limits error messages will provide links to unique pages that offer more information and ways to resolve the errors. The first rate limit we changed the link for is 'Duplicate Certificate'. Users who receive errors like too many certificates (5) already issued for this exact set of domains in the last 168 hours will also have the following link included:

We look forward to making more improvements to our rate limit documentation and errors. Additional changes will be shared in this thread.