docs(azure): cloud observability — supervision hors K8s (offre B)

[Garinlu]

Summary

• State-of-the-art for the Azure sprint's fourth ticket: observing Azure resources outside the cluster — service metrics, cost attribution, and quotas.
• Metrics: Azure Monitor's metrics:getBatch REST API, 300s interval — platform metrics are free to ingest and already retained 90 days, reading costs $0.01/1K calls. Log Analytics (Basic or Analytics Logs) is never part of the path: metrics never touch it, so none of its ingestion or query costs apply.
• Cost attribution: Cost Management Exports to the client's own storage account (free, CSV/Parquet, auditable by construction) — the Cost Details/Query API is refused as the audit source, rate-limited and called on the client's behalf rather than being their own dataset.
• Service coverage: Azure SQL, Storage Account, Service Bus, and Azure Cache for Redis in the standard perimeter, using the same systematic-and-actionable criterion as the other clouds.
• Quotas: Microsoft.Quota usages API (Compute + Network), same 300s pipeline, covering vCPU-per-family, public IPs, NSGs, and NAT Gateways by default.

Test plan

• Doc-only change — no code to test.
• Reviewed for the same structure and sourcing rules used across docs/aws/ and docs/gcp/.

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