letsencrypt was using "DST Root CA X3" as root authority previously. This root auth is expired now. So letsencrypt is using "ISRG Root X1" as root authority at the moment. But Jira (as well as Confluence and Bitbucket) do not accept new certificates.
Yes, theres a thing happening today with LetsEncrypt certificates.
Take a look at this big long thread from Scott Helme on Twitter:
https://twitter.com/Scott_Helme/status/1443569171581652993
See also this from LetsEncrypt themselves:
https://twitter.com/letsencrypt/status/1443248706166398984
https://community.letsencrypt.org/t/help-thread-for-dst-root-ca-x3-expiration-september-2021/149190/24
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