I have a simple table I created that is using the "Software service, operation, and site data" Data view. I am displaying Application, Software Service, Operation, Client Site, and Application Performance. I see that the Application performance on several sites are below 100%, however, in my tooltip for Application Performance, I display Slow ops, Fast ops, and Aborts.
I am seeing 0 Slow ops, but the App Performance is below 100%. I can't figure out what I am missing that would cause the performance to not be 100% since I have 0 slow operations.
I am thinking that you are running into an issue with the aggregations of the values in DCRUM. The data in the CAS is averaged in order to allow it to deal with the large amount of data that it has to process. Here is a post where a user ran into issues with hidden errors because of some minor aggregation. (https://answers.dynatrace.com/questions/162801/availability-and-affected-users.html?childToView=162807#answer-162807)
Hope this helps.