php
Restart workers on Memory Limits
Describe you feature request
Currently, in PHP, it allows setting a memory limit per a request. We also have worker scripts that restart based on the number of requests. Inspired by https://externals.io/message/126226, it may make sense to measure memory usage per the limit to handle potential memory leaks.
This needs a few things working together: GOMEMLIMIT for keeping the Go runtime in check, memory_limit ini settings, and the current container/cgroup memory limits (plus current number of threads).
From that, we can derive if a request is going to potentially exceed those limits, we can start a rolling restart of workers before handling the request. If after restarting the workers, and we are still brushing up against the limits, then we can assume there is a memory leak in go and we need to restart the entire process.
Note: this could also be an autoscaling strategy (density vs. speed)
It would also be possible to restart single threads, not sure how safe that is though. Some leaking extensions could hang on shutdown (#1296)
