Note: a subprocess must always have a none start event.

None End Event

Intermediate None Event (throwing)

The following process diagram shows a simple example of an intermediate none event, which is often used to indicate some state achieved in the process.

You can add some own code to the execution listener to maybe send some event to your BAM tool or DWH. The engine itself doesn’t do anything in the event, it just passes through it.

Camunda Extensions