applied objects that have been removed from the input manifest. This feature has remained in alpha ever since due to performance and correctness issues inherent in its design. This PR exposes a second, independent pruning alpha powered by a new standard named `ApplySets`. An `ApplySet` is a server-side object (by default, a Secret; ConfigMaps are also allowed) that kubectl can use to accurately and efficiently track set membership across `apply` operations. The format used for `ApplySet` is set out in ...

  The `EventsToRegister` in `EnqueueExtension` changed the return value from `ClusterEvent` to `ClusterEventWithHint`. `ClusterEventWithHint` allows each plugin to filter out more useless events via the callback function named `QueueingHintFn`.
  When the scheduling queue receives a cluster event, before moving each Pod from unschedulable pod pool to activeQ/backoffQ, it will call QueueingHintFn of plugins that rejected each Pod in the previous scheduling cycle.

* On body parsing errors, raise `from` previous exception, to allow better introspection in logging code. PR [#192](https://github.com/tiangolo/fastapi/pull/195) by [@ricardomomm](https://github.com/ricardomomm).

* Use Python logger named "`fastapi`" instead of root logger. PR [#222](https://github.com/tiangolo/fastapi/pull/222) by [@euri10](https://github.com/euri10).