Add pmax threshold check

[Tzvonimir]

[Title]

📚 Description of Changes

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• Why This Change:
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• K8s

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Summary by Gitar

• New spike protection metrics:
  • Added cpu_pmax and mem_pmax fields to ContainerHistoricalMetrics protobuf for capturing maximum resource usage over 24-hour window
  • Enables MPA autoscaler to account for traffic spikes in resource allocation decisions
• Historical metrics collector enhancement:
  • Extended fetchContainerPercentiles() with max_over_time() Prometheus queries for CPU and memory peaks
  • Results properly converted to appropriate units (cores→millicores for CPU, bytes for memory)

_{This will update automatically on new commits.}

[gitar-bot]

Code Review ✅ Approved

Clean, well-implemented addition of Pmax fields for spike protection. Proto changes are backward-compatible, PromQL queries follow established patterns, error handling is non-fatal and consistent with existing code. No issues found.

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