You can find the primary LTTng Documentation on the LTTng Documentation site. The documentation on this site is appropriate for intermediate to advanced software developers who are working in a Linux environment and are interested in efficient software tracing.
For information on LTTng in general, visit the LTTng Project site. You can find a "Getting Started" link on this site that takes you to an LTTng Quick Start.
Finally, you can access extensive help information on how to use the LTTng plug-in to search and analyze captured traces via the Eclipse help system:
Help | Help Contents | LTTng Plug-in User Guide