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The default queue implementation is mostly FIFO and it is not exchangeable unless we implement the whole `workqueue.Interface` which is less desirable as we have to duplicate a lot of code. There was one attempt done in [kubernetes/kubernetes#109349][1] which tried to implement a priority queue. That is really useful and [knative/pkg][2] implemented something called two-lane-queue. While two lane queue is great, but isn't perfect since a full slow queue can still slow down items in fast queue. This change proposes a swappable queue implementation while not adding extra maintenance effort in kubernetes community. We are happy to maintain our own queue implementation (similar to two-lane-queue) in downstream. [1]: https://github.com/kubernetes/kubernetes/pull/109349 [2]: https://github.com/knative/pkg/blob/main/controller/two_lane_queue.go Kubernetes-commit: 87b4279e07349b3c68f16f69a349a02bddd12f25