Atlassian has always focused heavily on providing API’s for their tools, to allow integration by third parties. One way they do this is by keeping their tools open to integration with other tools. Integrations can open up a whole new world of automation with Atlassian tools. Some actions that can be achieved by integrating Atlassian products with other tools are creating an issue from a failed build, reporting an outage on HipChat and much more.
TeamCity