So, you've got microservices and you're wondering about API Gateway circuit breakers.

hey everyone, i've been thinking about how to make our microservice architectures more resilient. we're looking at putting circuit breakers in at the API Gateway level. the idea is to stop cascading failures if a downstream service hiccups. what do you all usually do, or what libraries do you recommend? are there certain metrics that work best for tripping the breaker, and how do you handle the fallback? i'm really curious about what you've seen work in practice.