[DND-843][HELM]Add custom podMetrics support to HPA template

[liyaka]

Details

• Extend HPA template to support custom pod metrics via autoscaling.podMetrics
• Enables scaling on Prometheus Adapter custom metrics (e.g. scoring_executor_queue_size)
• Backwards compatible — no change if podMetrics is not set

Issues

DND-843

Usage

autoscaling:
  enabled: true
  podMetrics:
    - name: scoring_executor_queue_size
      averageValue: "100"

Testing

• Helm template renders correctly with podMetrics configured
• Helm template renders correctly without podMetrics (backwards compat)
• HPA picks up custom metric from Prometheus Adapter on dev/prod

🤖 Generated with Claude Code

[andrescrz]

LGTM.

[github-actions]

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