Hi Poh Chei
As Mike Suggestions Cover All but just few points to track the issue
1: You can try to pull report from different time range and identify from when it stopped coming ? Pls Try to r ember if there
is any change on that day on your env
2: Is there Any open defect /incident ? if yes then when did it upgraded lastly ? If recently no defect/incident then
you will not get any recent report
3: Check you All CEM services+ Tim are up and running > in case any thing hung then you may recycle your EM cluster
and check
4: Else enable debug for TCS em log and check if you found any error message provide you tim is receiving proper traffic.
Hope this will help you ..