We onboarded a significant number of new phones on Wednesday, January 29. Operations ran smoothly most of the day.
However, at approximately 4:00pm on Thursday, January 30, we noticed a significant increase in load on our systems that appeared to be sourced from call history. As a precautionary measure in order to ensure the stability of the system, we temporarily suspended access to call history while we investigated.
We determined the cause was a feature update to the permissions model of ZynoTalk. Adding an index to a database column restored performance to normal bounds.
Call history access was restored at 6:27pm.