The article introduces Heartbeat, a tool designed for uptime monitoring within the Elastic Stack, which became generally available with the 6.5 release. Initially a beta release in January 2017, Heartbeat acts as a lightweight shipper that monitors network endpoints using HTTP, TCP, or ICMP, and reports the status to Elasticsearch. Configuration involves listing URLs to monitor in a heartbeat.yml file, with periodic checks being executed to verify endpoint status. Data collected by Heartbeat is visualized in Kibana through pre-built dashboards, allowing users to detect issues such as outages or performance degradations. The tool can be combined with other Elastic Stack components like Metricbeat and APM for a comprehensive operational overview, aiding in faster incident resolution. Users can also customize dashboards or create new visualizations based on Heartbeat data, and leverage alerting and machine learning features for enhanced monitoring. The article encourages users to explore Heartbeat's functionality through its documentation and community forums.