Statsig change history: 5xx Spike for Client SDK Initialization

Statsig reported a major 5xx spike affecting Client SDK Initialization and Config Delivery API - US East 1, starting at 2025-07-18 15:10 UTC and resolved at 2025-07-18 15:21 UTC (11 min). Statsig shifted traffic to restore service and identified a GCP outage as the root cause.