With the release of TeamCity Integration for JIRA Cloud you can quickly and easily fetch TeamCity build data. You can further use this data in JIRA Cloud for viewing status of builds and the list of changes for each JIRA issue.
You can also easily track the development of your project with the TeamCity activity listing displayed for JIRA projects.
All you need is to add connections to the appropriate TeamCity servers.
Setup of connection to TeamCity server requires entry of the server address and credentials of the TeamCity user with sufficient permissions.