This adds information about detecting non-occurring events.
This adds information about detecting non-occurring events.

ramindu90/siddhi,mohanvive/siddhi,tishan89/siddhi,dilini-muthumala/siddhi,tishan89/siddhi,wso2/siddhi,grainier/siddhi,suhothayan/siddhi,wso2/siddhi,grainier/siddhi,suhothayan/siddhi,gokul/siddhi,dilini-muthumala/siddhi,minudika/siddhi,mohanvive/siddhi,ramindu90/siddhi,minudika/siddhi,gokul/siddhi