Health status of overall implementation checklist

Hi dear community! I was wondering if I would be able to find some advice around what I stated in the title. For a little bit of context, I´ve been out of this world for 2 years now and I have gone a bit rusty, the thing is that an old customer who I used to work with contacted me for aid in an implementation he carried out with Chirpstack (loraserver in my years lol) and asked me for a check of the service he implemented. I have some sort of places were to begin with, but I’m pretty sure you will be able to help me beyond my knowledge!
Any comments regarding some kind of checklist or places were to find issues are welcome!