- Metric buckets for `pod_start_duration_seconds` were changed to `{0.5, 1, 2, 3, 4, 5, 6, 8, 10, 20, 30, 45, 60, 120, 180, 240, 300, 360, 480, 600, 900, 1200, 1800, 2700, 3600}`. ([#120680](https://github.com/kubernetes/kubernetes/pull/120680), [@ruiwen-zhao](https://github.com/ruiwen-zhao))

- **Apps**
  - [stable] When replica sets cannot create pods, they will now report detail via the API about the underlying reason ([kubernetes/features#120](https://github.com/kubernetes/enhancements/issues/120))
  - [stable] `kubectl apply` is now able to delete resources you no longer need with `--prune` ([kubernetes/features#128](https://github.com/kubernetes/enhancements/issues/128))