Summary: D22381744 updated the version of `futures` in third-party/rust to 0.3.5, but did not regenerate the autocargo-managed Cargo.toml files in the repo. Although this is a semver-compatible change (and therefore should not break anything), it means that affected projects would see changes to all of their Cargo.toml files the next time they ran `cargo autocargo`.
Reviewed By: dtolnay
Differential Revision: D22403809
fbshipit-source-id: eb1fdbaf69c99549309da0f67c9bebcb69c1131b
Summary: Making a trait out of TimeWindowCounter will help with providing different implementations of load limiting for OSS and FB.
Reviewed By: krallin
Differential Revision: D21329265
fbshipit-source-id: 7f317f8e9118493f3dcbadb0519eaff565cbd882
