Seems to be lots of reports for this, but none recently it seems.
So, odata feeds are down, i emailed about this but was told to report it here.
https://data.stackexchange.com/
Click any of the sites... ie: https://data.stackexchange.com/stackoverflow/queries and you will see that there is a link to odata, but when you click it you get the page not found page: https://data.stackexchange.com/stackoverflow/atom