Amazon EventBridge now supports 22 additional Amazon CloudWatch metrics that enable you to monitor the performance of your event buses and proactively identify when you may need to increase your service quotas. Publishing events to an event bus now includes metrics such as API latency, event payload size, as well as number of successful, failed, and throttled events. For invocations, where EventBridge delivers an event to a target, such as AWS Lambda, new metrics provide visibility into retries, throttling, and end-to-end latency including the time it takes for a target to respond. These metrics provide deeper insight into your event-driven applications, and allow you to quickly identify and resolve issues as they arise.
Source:: Amazon AWS