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The specific systems I'm thinking of were Google-internal, but there's a close public analogue with Guice & Dagger:

https://github.com/google/guice

https://github.com/square/dagger

Imagine injecting Futures into your code. Now imagine injecting them, but having the Provider record a lot of metadata about who you were calling, how you were calling it, how long it took, whether an error occurred, letting an SRE turn off the call, etc.



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