Returns the top N most frequently used keys across ALL tenants or filtered tenants:

• Key identification and algorithm
• Usage count and limits
• Usage percentage of max limit
• Tenant identification

totalUsageCount covers the WHOLE inventory in scope, not only the limit keys listed, and is
served with the usageWindow it is measured over (ALL_TIME) plus the i18n key naming it.

Optional filtering: specify tenantIds to view specific tenants only.

Use this for platform capacity planning and identifying critical dependencies.