Cross-log group querying is useful in many application architectures that depend on multiple log groups for their logging, including traditional multi-tier applications, containerized environments, or serverless applications. For example, users can now detect a spike in errors or exceptions across multiple Amazon Lambda functions, or they can find log events related to a specific customer or account id across log groups from different containers. With the ability to run queries across multiple log groups at once, users can now see multiple log groups as if they were one, without having to centralize large volumes of logs in a single log group.