Automated cherry pick of #4487: Add missing capacity metrics in hierarchical queues

[JesseStutler]

Cherry pick of #4487 on release-1.12.

#4487: Add missing capacity metrics in hierarchical queues
For details on the cherry pick process, see the cherry picks page.

[gemini-code-assist]

Summary of Changes

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This pull request is an automated cherry-pick that enhances the observability of hierarchical queues within the scheduler. It introduces new metrics to report both the configured and actual capacities of these queues, providing a more comprehensive view of resource utilization and allocation within the system.

Highlights

• Metrics Enhancement: Added calls to metrics.UpdateQueueCapacity and metrics.UpdateQueueRealCapacity within the buildHierarchicalQueueAttrs function. This ensures that the configured and real-time capacities of hierarchical queues are now exposed as metrics.

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[gemini-code-assist]

Code Review

This pull request adds missing capacity metrics for hierarchical queues. Defensive nil checks have been suggested to improve code robustness.

[Monokaix]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Monokaix

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[hwdef]

/lgtm