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A team wants an HPA to scale on request rate. What does the Metrics API alone provide?

  1. CPU and memory only
  2. Any metric a node exposes on /metrics
  3. CPU, memory and network throughput
  4. Whatever cAdvisor collects, including per-container disk usage
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Answer: A. CPU and memory only

The Metrics API deliberately carries only the CPU and memory needed for autoscaling; anything richer requires a second pipeline serving the Custom Metrics API.

Source: Resource metrics pipeline (Kubernetes) — Resource metrics pipeline (overview)

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