How to compute for php-fpm child process on a Kubernetes Cluster

I have recently migrated my application from a single server w/ docker into Google Kubernetes Engine for the reasons of scaling. I am new to the kubernetes platform, and I may not yet fully understand the concepts of it but I do get the basics.

I have successfully migrated my application on a cluster size of 3 each with 1vCPU and 3.75 GB RAM

Now I came across on what is the best configuration for the php-fpm processes running in a kubernetes cluster. I have read a few articles on how to setup the php-fpm processes such as

https://serversforhackers.com/c/php-fpm-process-management

https://www.kinamo.be/en/support/faq/determining-the-correct-number-of-child-processes-for-php-fpm-on-nginx

On my cluster I have an Elasticsearch, Redis, Frontend and a REST Api and my understanding about kubernetes, each has their own pods running on my cluster, I tried to access the pod for the REST Api and see 1 vCPU and 3.75 GB RAM which is what I set on my cluster specs. And the RAM has only 1.75GB left, so I think there are other services or pods using the memory.

So now I wanted to increase the size of the following based on the articles I shared above.

pm.max_children = 5
pm.start_servers = 2
pm.min_spare_servers = 4
pm.max_spare_servers = 8 

But my problem is since the pod is on a worker, if I change the configuration base on the available memory left (base on the articles I shared above on Calculating pm.max_children) I might end up a pod consuming all memory space left, and will not be able to allocate for the other services. Is my problem makes sense? or is there an idea I am missing?

Base on the article since my worker has 3.75 GB RAM and and other services is already consuming 1.5GB ram so my best aim is at 1 GB RAM.

pm.max_children brings us to 1024 Mb / 60 Mb = 17 max_children

pm.max_children = 17
pm.start_servers = 8
pm.min_spare_servers = 7
pm.max_spare_servers = 10
pm.max_requests = 500

Which leads me to the question How to compute for the php-fpm child process on a Kubernetes Cluster when there are other services or pods shares the same resources.

Thank you for reading until the end, and thanks in advance for your inputs.

from How to compute for php-fpm child process on a Kubernetes Cluster