From 06/23 - 06/24, an un-anticipated edge case caused some data corruption in the analytics database. As we've explained before, Apigee has been architected to be highly available. Please note that this did not affect API traffic passing through Apigee in any way, only the analytics that Apigee creates from that traffic. So if you notice an apparent dip in your traffic graphs during this period, there is a good chance that it was related to this issue.
We have patched the issue and added a general monitoring process for this kind of issue in the future.