support pod bootstrap "checkpointing" in the kubelet

[calebamiles]

Feature Description

• One-line feature description (can be used as a release note): support pod "checkpointing" in the kubelet for self hosting
• Primary contact (assignee): @timothysc
• Responsible SIGs: SIG Cluster Lifecycle, SIG Node
• Design proposal link (community repo): RFE: Bootstrap Checkpointing - Modify manifest behavior slightly for self hosting.  kubernetes#49236
• Reviewer(s) - (for LGTM) recommend having 2+ reviewers (at least one from code-area OWNERS file) agreed to review. Reviewers from multiple companies preferred: @timothysc, @dchen1107
• Approver (likely from SIG/area to which feature belongs): @dchen1107
• Feature target (which target equals to which milestone):
  • Alpha release target 1.9
  • Beta release target (TBD)
  • Stable release target (TBD)

[luxas]

@roberthbailey this seems to miss the v1.8 target? Should we move to next-milestone?

[roberthbailey]

Yes.

[timothysc]

Proposal is here -> https://github.com/kubernetes/community/pull/1241/files
Implementation (refreshing this week) -> https://github.com/kubernetes/kubernetes/pull/50984/files