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Uptime statistics for major identity providers (e.g., Auth0, Okta, Microsoft Entra) typically exceed 99.9% ("three nines") reliability, with some achieving 99.99% ("four nines"). Metrics are measured via Service Level Agreements (SLAs), with downtime often caused by maintenance, DDoS attacks, or cloud outages. Providers use multi-region redundancy, load balancing, and failover systems to minimize disruptions.