Which "Protocol" are you using in your PutSplunk processor.
There is no assurance or delivery if you are using UDP. With TCP protocol there is confirmed delivery.
You could use NiFi's provenance to track the FlowFile's processed by the PutSplunk processor.
This will allow you to get the details on FlowFiles that have "SEND" provenance events associated to them.
Which "Protocol" are you using in your PutSplunk processor.
There is no assurance or delivery if you are using UDP. With TCP protocol there is confirmed delivery.
You could use NiFi's provenance to track the FlowFile's processed by the PutSplunk processor.
This will allow you to get the details on FlowFiles that have "SEND" provenance events associated to them.