Returns the full set of network health metrics for the tenant. Each metric
represents a risk indicator (e.g., stale accounts, locked-out accounts,
GPO violations) with a current count and a contribution to the overall
network health score (0–100, higher is healthier).

Metric categories include:

• Active Directory hygiene (stale accounts, expired passwords, reversible encryption)
• Detection posture (unacknowledged high/critical detections)
• Privilege management (delegated/privileged domain accounts)
• IT operations (service account failures, circular groups)