Keys
To rotate, issue the new key, switch your application, then revoke the old one.
Sites
Open Sites & keys and add the domain where your page runs. Each site has its own public keys and session history. Both the collector and widget require a verified domain. On the site’s panel, set the domain and publish the token as a DNSTXT record at _heretic.<domain> with the value heretic-site-verification=<token>, or as the body of https://<domain>/.well-known/heretic-site-verification. Press Check now. Changing the domain requires verification again.
Retiring a site stops collection and verdict reads for its keys. Deleting it also removes its stored verdicts. Unknown, deleted, and foreign request IDs all answer 404.