Why do you care? Do you think this helps your customer at all? Perhaps you're worried about your technical reputation. All you're doing is moving the blame to some part of your code to the decision you made to host on Heroku. Down is down. Unavailable is unavailable. To your customers that's all that matters. For what it's worth I think hosting on Heroku makes plenty of sense and I'm actually moving my app (Crisply)…
1) This isn't a bug with our software. They don't need to worry about the security of their data or anything else like that.
2) There's no point in getting mad at us. Sure we chose our hosting provider, but we're just as upset about the downtime as the customer is.
3) This problem is affecting other websites as well. People seem to be better at handling stress if they think everyone else is stressed out too.
4) There's a team of professionals working on the problem. My customers know I run a small company, and they seem to appreciate knowing that a much larger company handles the hosting.