[alhirzel]

You can get a good view on some architectures from AOSA, thought it may not be as focused on web as you're looking for:

http://aosabook.org/en/index.html

A good example is Scalable Web Architecture and Distributed Systems by Kate Matsudaira:

http://aosabook.org/en/distsys.html

[klenwell]

On topic of architecture of open source applications, Wikimedia shares this:

https://meta.wikimedia.org/wiki/Wikimedia_servers

[FelipeCortez]

It's pretty cool how their Grafana is open https://grafana.wikimedia.org/d/000000002/api-backend-summar...

[honkdaddy]

Very cool!

At what level of scale might one expect to need what's going on in the "Edge Cluster", as opposed letting all the requests fly right into the app servers?

[buescher]

Thanks! I didn't know about the AOSA books. There are some really nice examples of top-level software documentation in them.

[DougMellon]

Wow, those all look fantastic. Thank you for sharing!