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Merge pull request #82853 from Huang-Wei/release-note-1.16-update

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Update 1.16 CHANGELOG with introduction of feature EvenPodsSpread
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@ -339,6 +339,7 @@ The main themes of this release are:
- Introduction of the pod overhead feature to the scheduler. This functionality is alpha-level as of - Introduction of the pod overhead feature to the scheduler. This functionality is alpha-level as of
Kubernetes v1.16, and is only honored by servers that enable the PodOverhead feature.gate. ([#78319](https://github.com/kubernetes/kubernetes/pull/78319), [@egernst](https://github.com/egernst)) Kubernetes v1.16, and is only honored by servers that enable the PodOverhead feature.gate. ([#78319](https://github.com/kubernetes/kubernetes/pull/78319), [@egernst](https://github.com/egernst))
- Ephemeral containers have been added in alpha. These temporary containers can be added to running pods for purposes such as debugging, similar to how `kubectl exec` runs a process in an existing container. Also like `kubectl exec`, no resources are reserved for ephemeral containers and they are not restarted when they exit. Note that container namespace targeting is not yet implemented, so [process namespace sharing](https://kubernetes.io/docs/tasks/configure-pod-container/share-process-namespace/) must be enabled to view process from other containers in the pod. ([#59484](https://github.com/kubernetes/kubernetes/pull/59484), [@verb](https://github.com/verb)) - Ephemeral containers have been added in alpha. These temporary containers can be added to running pods for purposes such as debugging, similar to how `kubectl exec` runs a process in an existing container. Also like `kubectl exec`, no resources are reserved for ephemeral containers and they are not restarted when they exit. Note that container namespace targeting is not yet implemented, so [process namespace sharing](https://kubernetes.io/docs/tasks/configure-pod-container/share-process-namespace/) must be enabled to view process from other containers in the pod. ([#59484](https://github.com/kubernetes/kubernetes/pull/59484), [@verb](https://github.com/verb))
- Pod spread constraints have been added in alpha. You can use these constraints to control how Pods are spread across the cluster among failure-domains. ([#77327](https://github.com/kubernetes/kubernetes/pull/77327), [#77760](https://github.com/kubernetes/kubernetes/pull/77760), [#77828](https://github.com/kubernetes/kubernetes/pull/77828), [#79062](https://github.com/kubernetes/kubernetes/pull/79062), [#80011](https://github.com/kubernetes/kubernetes/pull/80011), [#81068](https://github.com/kubernetes/kubernetes/pull/81068), [@Huang-Wei](https://github.com/Huang-Wei))
### CLI Improvements ### CLI Improvements
@ -1615,7 +1616,7 @@ filename | sha512 hash
* - http_404_request_total (the number of 404 requests handled) * - http_404_request_total (the number of 404 requests handled)
* - http_404_request_duration_ms (the amount of time the server took to respond in ms) * - http_404_request_duration_ms (the amount of time the server took to respond in ms)
* Also includes percentile groupings. The directory for the default 404 handler includes instructions on how to enable prometheus for monitoring and setting alerts. * Also includes percentile groupings. The directory for the default 404 handler includes instructions on how to enable prometheus for monitoring and setting alerts.
* The kube-apiserver has improved behavior for both startup and shutdown sequences and also now exposes ` eadyz` for readiness checking. Readyz includes all existing healthz checks but also adds a shutdown check. When a cluster admin initiates a shutdown, the kube-apiserver will try to process existing requests (for the duration of request timeout) before killing the apiserver process. ([#78458](https://github.com/kubernetes/kubernetes/pull/78458), [@logicalhan](https://github.com/logicalhan)) * The kube-apiserver has improved behavior for both startup and shutdown sequences and also now exposes `/readyz` for readiness checking. Readyz includes all existing healthz checks but also adds a shutdown check. When a cluster admin initiates a shutdown, the kube-apiserver will try to process existing requests (for the duration of request timeout) before killing the apiserver process. ([#78458](https://github.com/kubernetes/kubernetes/pull/78458), [@logicalhan](https://github.com/logicalhan))
* The apiserver also now takes an optional flag "--maximum-startup-sequence-duration". This allows you to explicitly define an upper bound on the apiserver startup sequences before healthz begins to fail. By keeping the kubelet liveness initial delay short, this can enable quick kubelet recovery as soon as we have a boot sequence which has not completed in our expected time frame, despite lack of completion from longer boot sequences (like RBAC). Kube-apiserver behavior when the value of this flag is zero is backwards compatible (this is as the defaulted value of the flag). * The apiserver also now takes an optional flag "--maximum-startup-sequence-duration". This allows you to explicitly define an upper bound on the apiserver startup sequences before healthz begins to fail. By keeping the kubelet liveness initial delay short, this can enable quick kubelet recovery as soon as we have a boot sequence which has not completed in our expected time frame, despite lack of completion from longer boot sequences (like RBAC). Kube-apiserver behavior when the value of this flag is zero is backwards compatible (this is as the defaulted value of the flag).
* fix: make azure disk URI as case insensitive ([#79020](https://github.com/kubernetes/kubernetes/pull/79020), [@andyzhangx](https://github.com/andyzhangx)) * fix: make azure disk URI as case insensitive ([#79020](https://github.com/kubernetes/kubernetes/pull/79020), [@andyzhangx](https://github.com/andyzhangx))
* Enable cadvisor ProcessMetrics collecting. ([#79002](https://github.com/kubernetes/kubernetes/pull/79002), [@jiayingz](https://github.com/jiayingz)) * Enable cadvisor ProcessMetrics collecting. ([#79002](https://github.com/kubernetes/kubernetes/pull/79002), [@jiayingz](https://github.com/jiayingz))