When you’re new to a bug report that’s already had quite a bit of activity, it can take a few minutes to get a hang of what’s been happening.
Launchpad gives you a shortcut that lets you quickly see the history of the bug: the bug activity log.
Let’s take a look at a bug I’ve been working on recently: bug 544799. While the main bug page gives you the current description, comment history and details of status changes, you can get a concise yet comprehensive overview of the bug’s history by following the See full activity log link.
So, when you need to get up to speed on a bug report, head for the activity log.