Datadog has integrated with Apache Hadoop, allowing users to immediately start monitoring four key technologies: HDFS, MapReduce, YARN, and Spark. This integration provides visibility into various metrics such as data node status, disk space usage, job performance, and more, enabling easier collaboration and problem-solving for distributed systems running on many machines. With the integration turned on, users can set alerts for critical issues and gain insights into their Hadoop ecosystem, making it a valuable tool for companies with large amounts of data to process. The integration is available for both existing Datadog users and new sign-ups, providing an easy way to monitor and optimize Hadoop performance.