Sometimes you find out from QA department that starting with a specific date an endpoint from your application started to work a little bit slowly
if that date is last week, or I don’t know, it happen last month, the simple solution it will be to do an export of all commit between two specific days
git log -p master@{2016-06-02}..master@{2016-06-02}
git log -p master@{2016-06-02}..master@{now}
git log -p master@{1.hour.ago}..master@{now}
for more info see this page
git-log