Answers
1) What happened?
Google Analytics experienced a data processing error from April 30 to May 5. Almost all of the data has been recovered and is currently being reprocessed. The recovered data will be reflected in your reports by May 14. Please note that a small percentage of data, particularly in the area of e-commerce reporting, was not recoverable from those dates.
We take this issue seriously and apologize for any inconvenience. We will do everything possible to prevent such disruptions from occurring in the future.
2) How does this affect me?
Most Analytics accounts were affected by the reporting error. Your data will be restored this week, and we've recovered the majority, though not all of it. A very small percentage of data, particularly relating to e-commerce transactions that occurred between April 30 and May 5, is not recoverable.
3) I don't use e-commerce. Does this affect me?
Analytics users who don't have e-commerce enabled may have seen a slight dip in traffic only between the dates April 30 to May 5. The data is being reprocessed and will be reflected in reports by May 14. Please note that a small percentage of data, particularly in the area of e-commerce reporting, may not be recoverable from those dates.
4) I do use e-commerce. How am I affected?
Analytics users who do use e-commerce would have noticed a decline in e-commerce transactions being reported starting from April 30 to May 5. The data is being reprocessed and will be reflected in reports by May 14. E-commerce transactions were affected more heavily than other metrics, and a small percentage of e-commerce data from those dates may not be recoverable. We apologize for any inconvenience that this has caused.
5) Is my AdWords data accurate?
Yes. AdWords data was not affected. However, ROI calculations within Analytics reporting may be slightly off from April 30 to May 5 due to missing e-commerce transactional data. This does not affect AdWords impression, clicks, billing or other AdWords data.