The errgroup package we’ve been looking at lately has one more trick up its sleeve: Limiting the number of running goroutines. Let’s imagine we’re building an HTTP handler that responds with a list of all customer orders. Doing so, requires making a number of calls to the ‘orders’ microservice. Some customers may have made hundreds or thousands of orders. We don’t want to look them all up simultaneously, so we’ll limit our client to 10 concurrent requests.
