[whafro]

It's not a great long-term solution, but DNSimple has been disabling their ALIAS support, which many Heroku and AWS users are likely to depend on, especially if you use SSL.

Short term, keep your ALIAS record and add an additional A record for your root domain pointing to one of the IPs indicated by your hostname. DNSimple says they'll treat the A record as a fallback when ALIAS isn't working, and will return both sets of records when it is (https://twitter.com/dnsimple/status/341574753276002304).

For the next 3/12/24/96 hours or however long it takes for the threat to subside, this should increase your availability, and the likelihood that your A record will work for that time is probably reasonable. Longer term, you'll want to get rid of the A record.