Heroku: DNS Propagation Delays in Common Runtime and Private Spaces

Seems like related issue was in Aug 2022: https://news.ycombinator.com/item?id=32572906

and might be fixed: We just deployed a workaround that brought our site back up. 1. Find your DNS Target in heroku. It should end with .herokudns.com

2. Lookup the historical DNS record to get the IP addresses. You can find historical DNS records here: https://securitytrails.com/dns-trails

3. Replace your CNAME record in your DNS provider with A records that point to the IP addresses you just found.

Your site should come back up shortly. We plan to revert back to CNAME records once Heroku gets their DNS issues sorted.