It's certainly possible that this is unrelated, but I've been noticing some performance issues on our Phabricator install. Looking at the following graphs from CloudWatch, you can see that the CPU usage seems noticably higher after the 4th of May.
{F400361, size=full}
Furthermore, on a couple of occasions I have SSHed into the instance and seen the CPU usage pegged at 100% across all four cores (it is a `c3.xlarge`). Interestingly, the CPU usage is caused by `php-fpm` rather than `pygmentize`. I have added the following script to help me diagnose the issue:
{P1780}
I haven't found anything yet, but I've been out of office for a while.