Vercel Reliability Patterns

Overview

Build fault-tolerant Vercel deployments with circuit breakers, retry logic, graceful degradation, and instant rollback integration. Addresses reliability at two levels: function-level resilience (protecting against dependency failures) and deployment-level resilience (protecting against bad deploys).

Prerequisites

• Vercel project deployed to production
• Understanding of failure modes in serverless
• External dependencies (databases, APIs) identified

Instructions

Step 1: Circuit Breaker for External Dependencies

// lib/circuit-breaker.ts
type CircuitState = 'CLOSED' | 'OPEN' | 'HALF_OPEN';