(Tedious disclaimer: my opinion, not my employer's. Not representing anybody else. I'm an SRE at Google, and use some of this stuff all the time.) In all hones

(Tedious disclaimer: my opinion, not my employer's. Not representing anybody else. I'm an SRE at Google, and use some of this stuff all the time.) In all honesty, this diagram is missing so much information that you won't learn very much from it about how we do things (and all the things you can't see are confidential). It's more like a map of the relationships between the few bits that have been published. However, I would tend to agree with your final suggestion that data structures are much more interesting than code.