Comment by toomanybeersies

I had that exact conversation at my old job. They only started listening to me when some requests started timing out because of Heroku's 30 second request duration limit.

Same thing happened with memory consumption. The problem was ignored until we regularly had background jobs using > 4 GB of memory, causing cascading failures of our EC2 instances and a whole bunch of strange behaviour as the OOM killer sniped random processes.