Eventsource

As per the documentation

Script Output Format

Regardless of whether it is an embedded or external script, the output needs to be a JSON object with an array of one or more events, like this:

{    "events" : [                  {                     "happenedOn":"Fri Jun 05 09:17:47 UTC 2015",                      "severity":"Warn",                      "message":"This is the first event's message",                      "Source":"This is the source of the first event"                   },                   {                     "happenedOn":"Fri Jun 07 09:27:37 UTC 2015",                      "severity":"critical",                      "message":"This is the second event's message",                      "Source":"This is the source of the second event"                   }               ]}