I have a couple of problems with Google Analytics API.
So it looks like the historical data was modified - specifically all the data > August 2013.
I also noticed the overall number of sessions (total number of sessions for all metros) stays the same. However the "not set" sessions is way much bigger and then each big metro has less sessions (somehow the attribution changed but I have no idea how and why).
Any idea what is causing these discrepancies? I thought the historical data is static and not changing over night without notice. I am really confused.
Thank you for your help.