Expose an endpoint /metrics to fetch specific metrics (e.g., request rate, error rate, latency) for workloads or services over a given time range.
Integrate with Prometheus or another telemetry backend for real data.
This API will serve as the foundation for time-based visualizations and analysis.

Deliverables:

• /metrics?target=workload|service&metric=&start=&end= endpoint.

• Integration with Prometheus client or adapter.

• Caching and validation for query ranges.