Customer.io Reliability Patterns

Overview

Implement fault-tolerant Customer.io integrations: circuit breaker (stop cascading failures), retry with jitter (handle transient errors), fallback queue (survive outages), idempotency guard (prevent duplicates), and graceful degradation (never crash your app for analytics).

Prerequisites

• Working Customer.io integration
• Understanding of failure modes (429, 5xx, timeouts, DNS failures)
• Redis (recommended for queue-based patterns)

Instructions

Pattern 1: Circuit Breaker

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