Historical performance data

Use case

OpenStack is really rapidly developed. Hundreds of patches are merged daily and it's really hard to track how performance is changed during time. It will be nice to have a way to track performance of major functionality of OpenStack running periodically rally task and building graphs that represent how performance of specific method is changed during the time.

Problem description

There is no way to bind tasks

Possible solution

• Add grouping for tasks
• Add command that creates historical graphs