Add a performance counter which can measure if Event frame reconciliation is performed correctly

Currently we only can tell an event frame reconciliation is performed by the green check after auto calculation, and it is not very easy to monitor.
Since event frame usually use for alarms to operators. Accuracy is very important. We try to avoid incorrect events to be generated such as overlapping event frame causing by EF reconciliation malfunction.
We would like to have one or more monitor counters which help us to tell if EF reconciliation is not working properly, so that we can act quickly to identify the issue and minimize the damage caused by the incorrect alarms sent out.