Returns aggregated expiration report across ALL tenants or filtered tenants:

• urgencyCriticalBelowDays, urgencyWarningBelowDays and urgencyCautionBelowDays, the
  strict day boundaries that band daysUntilExpiration into critical / warning / caution —
  served, so the reader is told which rule produced the urgency it is looking at
• Keys in warning period (soft expiration reached)
• Keys approaching expiration within threshold
• Breakdown by tenant

Optional filtering: specify tenantIds to view specific tenants only.

Use this for proactive platform-wide key renewal planning.