Checkmk is a comprehensive IT monitoring system that enables system administrators, IT managers, and DevOps teams to identify issues across their entire IT infrastructure and act quickly to resolve them. It offers service state monitoring with 2,000+ checks 'out of the box', log and event-based monitoring, metrics, dynamic graphing, and long-term storage, comprehensive reporting incl. availability and SLAs, flexible notifications and automated alert handling, monitoring of business processes and complex systems, hardware and software inventory, graphical, rule-based configuration, and automated service discovery. It is ultra-scalable, has one of the shortest set-up times and lowest operations efforts in the industry, and has a very low Total Cost of Ownership. It supports 5+ Server operating systems and many options to realize ‘High Availability’, including own appliance. Customers include Airbus, Bosch, Continental, Zalando, Swisscom, Deutsche Telekom, DB Schenker, The Linde Group, BT Group, Marketo, Groupon, and Hortonworks.