Reserved RTR fields values.
MC2 EJM uses RTR sentBy field to mark EJM task which executed by MC2 EJM.
If sentBy field equals to “MC2EJM” it means that task is executed by MC2 EJM and can be processed differently than without this value.
For instance extract task which runs eagle_ml-2-0_default_out_extract_service in case sentBy=MC2EJM will do not run any distribution and run mc2 task reporter instead of running internal task reporter emulation. So do not set sentBy to MC2EJM in manually executed tasks.