Documentation for JIRA 4.2. Documentation for other versions of JIRA is available too.
Perforce is supported by Atlassian FishEye, providing comprehensive integration with JIRA including real-time notifications of code changes plus web-based reporting, visualisation, search and code sharing. For details, please see Integrating JIRA with FishEye.
The original Perforce Plugin for JIRA is deprecated and has been superseded by the JIRA FishEye Plugin, which is included with JIRA and provides Perforce integration (see the documentation).