This has a nice web page in a format like a forum discussion post where you can write a summary of your commits that you wanted to request to be merged. Other team members can comment on your post. Markdown is supported. A very nice way to let other people check/review your code and document their suggestions.
Example blame history. Comparing to history, which shows the exact change of each commit on the file, blame shows the current file and label each section with the corresponding commit. Hence, you can blame the bad code/text on an exact commit.