The degraded performance was identified to be caused by a third-party who was actively attempting to overload one of our systems by directing a large amount of traffic to it.
Our team was able to identify the incoming traffic and prevent it from further affecting the performance of the system. We can confirm that this did not impact the security, confidentiality or integrity of customer data.
During the period of degraded performance, there may have been intermittent latency on processing open counting and link redirects events, and in some rare cases, some events may not have been processed resulting in links not redirecting.
While not all users would have experienced the issue, it is possible that some users may have intermittently experienced the degradation as early as 12:00 PM PST on December 3rd.