php
interface to collect necessary stats for building a k8s readiness probe.
Describe you feature request
Is your feature request related to a problem? Please describe. I am very new to frankenphp so could certainly have missed something in the docs that allow me to do this.
I am trying to deploy frankenphp to k8s. I would like to sanely configure readiness probes to keep instances from getting overloaded with requests. I think this would predominantly come down to having 2 key metrics:
- how many of the workers are currently handling a request
- how many requests are queued up waiting for workers
Additional metrics may be good:
- avg delay before queued requests are dispatched?
Describe the solution you'd like I would like to have some sort of interface (http, cli that can be invoked, etc) which would export the above and perhaps more. I would then write a script to be executed which would retrieve that info, allow for some threshold of queued requests waiting for a thread, and if above the threshold k8s would stop sending traffic to that instance until things settle a bit.
Ideally the metrics would exclude any requests that are for non-php workers (ie: static files, etc).
Perhaps the caddy admin port already has some of this data?
Describe alternatives you've considered I can have an endpoint in my app, but that seems less than ideal as each check would itself take up a thread/worker.
