Our app crashed the other day because it exceeded the MaxClients limit, which currently has a default setting of 1. Isn't this a little bit small? Should it be set to a higher value by default?
Properly enable Nginx and PHP error logging.
The new version of PHP support on Heroku runs Apache with a different configuration (no more MaxClients 1, FastCGI for PHP, event MPM). As an alternative, you can also use Nginx. Check out the blog post and the Dev Center category with the Getting Started Guide and other resources!