- In short
- In a multi-tenant deployment, a shared API key across tenants makes it impossible to attribute a rate-limit breach or cost spike to the tenant that caused it. Separate API keys per tenant provide both isolation, so one tenant's load cannot silently exhaust another's budget, and attribution, so the source of a spike is identifiable. Without per-tenant keys, an organisation-level rate-limit trip is visible but its source is not, and request-level logging alone does not close that gap.
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