When should you consider implementing circuit breakers?

hey everyone, i have been thinking a lot about distributed systems lately, and specifically how we deal with failures between services. we all know that cascading failures are a real danger. i'm curious to hear your experiences and thoughts on when it's the right time to introduce circuit breakers. are you looking at specific failure rates, latency spikes, or something else. what are the common pitfalls you've seen when implementing them, let's discuss