Thanks, that article on Consumer Driven Contract Tests looks interesting! I put it on my list!
Chaos Monkey is definitely a good tool to test and harden your production system.
I still think there is room for more material in that space. There are just too many aspects that matter for ensuring a complex system is working properly.
I really like this article talking about staging environments and yet I think there needs to be more material and examples about setting up automated tests in an as realistic as possible staging env.
Testing in production is another big topic. There are many thing you can do around A/B and split testing. There are great tools like GitHub's scientist, that solve specific use cases and of course there is a lot to say about monitoring and observability.
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