This page has been replaced by a more general world wide transparency report. Using it, you can find not only traffic disruptions but also the volume of government queries for some countries.
The China specific portion equivalent to this report page is here. It charts query volume for various Google properties over time. The new report shows each region's fraction of world wide volume scaled such that 100% is the highest ever seen from that region. Service disruptions will show up as dips in the graphs.
This page will redirect to the new site in 60 seconds.