[proposal] Support the resource management for Mid-tier pods.

[saintube]

What is your proposal:

Support the resource management for Mid-tier pods in the koordlet:

• [ ] Identify the extended resources of Mid-tier.
  • [ ] In the runtime hook, Set the necessary cgroups for Mid+BE pods/containers, just like the BatchResource hook.
  • [x] In the metrics module, export the node allocatable and pod requests/limits about Mid resources. #1874
• [x] Distinguish pods with priority classes (non-Prod) apart from the QoS. #1469

Why is this needed:

The #1361 adds the Mid-tier resource, allowing a pod with Mid priority class to allocate kubernetes.io/mid-cpu and kubernetes.io/mid-memory resources. However, the resource management of Mid-tier is not fully supported in the koordlet. For example, the koordlet does not set the related cgroups like cpu.cfs_quota_us for a Mid+BE pod.

[saintube]

/area koordlet

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the issue is closed You can:
• Mark this issue or PR as fresh with /remove-lifecycle stale
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[saintube]

/remove-lifecycle stale

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, the issue is closed You can:
• Mark this issue or PR as fresh with /remove-lifecycle stale
• Close this issue or PR with /close Thank you for your contributions.

[saintube]

/remove-lifecycle stale

[j4ckstraw]

https://github.com/koordinator-sh/koordinator/pull/1874 export mid resource metric