circuit breakers, what do you use? i dont have a strong preference.

hey everyone, i've been thinking a lot about fault tolerance in distributed systems lately, specifically how to prevent cascading failures. circuit breakers seem like a good pattern, but i've seen a few different ways to implement them. some use simple timeouts, others have more complex logic with retry budgets and monitoring. what are your favorite libraries or approaches for implementing circuit breakers? any gotchas to watch out for?