Each account has a concurrency limit in Lambda. This limit specifies the number of function invocations that can be running at the same time. Each function can reserve a chunk of the account’s concurrency limit, guaranteeing the function exactly that much concurrency. Otherwise, a function will run off the unreserved concurrency limit.
When the concurrency limit is hit, Lambda will not invoke a function and will throttle it instead. Blue Matador monitors your functions for throttles so you know when you need to adjust your concurrency.
