[likis]

We have been using all those GCP products and more without any significant problems.

But I do agree, there are some gotchas. PubSub examples: Duplicated messages, shitty DLQ implementation (in my opinion), some developers had improper error handling which lead to to infinite resends of messages (because they nacked message on error), etc..

However, I think the scaling and setup weighs up for all of that. You just need to specify a topic and subscription, and then you don't really have to care about resources or scaling at all, and that is SUPER nice. Also, PubSub is stupidly cheap in comparison to any other similar product, at least that I know of.