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Vercel
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Edge Compute Resilience

1 post · Aug 2024 – Oct 2025

What this trail covers

Vercel's Edge Middleware and Edge Functions experienced a significant outage due to an upstream provider's global configuration error. The platform is accelerating efforts to enhance resilience by improving configuration management with the provider, developing a backup option for Edge Middleware and Edge Functions, and working towards unifying the compute subsystem for Edge, Edge Functions, and Serverless Functions to reduce provider dependency.

All Vercel trails
  1. Update regarding Vercel service disruption on October 20, 2025This post details a service disruption caused by an AWS `us-east-1` outage, which impacted Vercel's production traffic serving and control plane. The primary incident involved a cascading failure in Vercel's global caching infrastructure, leading to temporary disruption of static file serving. A secondary incident affected the control plane due to a feature flag provider outage. The post explains the request lifecycle and where failures occurred, highlighting the impact on DNS, CDN, L3-L5 protections, TLS handshake, L7 Firewall, deployment metadata, and regional cache services. It notes that while global deployment metadata and L3-L5 protections worked, the regional cache service experienced a cascading failure. The post also details the control plane disruption caused by a feature flag provider outage, impacting the dashboard, CLI, and APIs.
  2. Update regarding Vercel service disruption on August 7, 2024This post details a 26-minute outage of Vercel's Edge Middleware and Edge Functions caused by an upstream provider's erroneous global configuration. The incident affected 61% of invocations. Vercel's response involved identifying the issue, confirming no internal changes, communicating with the provider, and mitigating the disruption via a configuration override. Lessons learned and future mitigations include improving configuration management with the provider, developing a backup option for edge compute services, and unifying the compute subsystem for Edge, Edge Functions, and Serverless Functions to reduce provider dependency.