Comment by 6LLvveMx2koXfwn

Not sure whether it has been updated since your comment, but the sentence now reads:

    GitHub has had 1125 incidents since March 2016. Over the last 3 months, they've averaged 24 incidents per month

edit: although they also have 1.2 days of downtime (in a day) for their 'worst days' of downtime table, which suggests some auto number crunching is not working as expected.