Custom Counter on Flink File Source

[Kirti Dhar Upadhyay K via user]

Hi Community,

I am trying to add a new counter for number of files collected on Flink File 
Source.
Referring the doc  
https://nightlies.apache.org/flink/flink-docs-master/docs/ops/metrics/ I 
understand how to add a new counter on any operator.

this.counter = getRuntimeContext().getMetricGroup().counter("myCounter");

But not able to get this RuntimeContext on FileSource.
Can someone give some clue on this?

Regards,
Kirti Dhar