Sensu is an open-source monitoring system designed to help organizations track the health and performance of their IT infrastructure. It allows users to collect and analyze data from various sources, such as servers, applications, and network devices, providing insights into system performance and potential issues. Sensu is highly customizable, enabling users to define checks and alerts based on their specific needs. The platform operates using a client-server architecture, where agents installed on monitored systems send data to a central server. This data can then be visualized and acted upon through integrations with other tools, such as Grafana for dashboards or Slack for notifications, enhancing overall operational efficiency.