Prometheus Metrics for Your Node.js Circuit Breakers (opossum-prom)

Prometheus Metrics for Your Node.js Circuit Breakers (opossum-prom) You've added opossum circuit breakers to protect your Node.js app from cascading failures. Good. But do you know when they're open? How often they're failing? What your 95th percentile fallback latency is? Without metrics, a circuit breaker is a black box. It's protecting you, but you can't see what's happening. Production debugging becomes guesswork. Today I'm releasing opossum-prom — zero-boilerplate Prometheus metrics for opossum circuit breakers. One line to add. Everything you need to know, surfaced to Grafana. The Problem With Unobserved Circuit Breakers Here's a typical production scenario: your payment service is intermittently failing. Orders are going through but your error rate is climbing. Is the circuit breaker helping? Is it stuck open? Is it in half-open state and rejecting valid requests? Without Prometheus metrics, you're flying blind. With them, you can write alerts like: # Fire a warning if any circu