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Need the way to create custom metrics


I need to know the way to implement custom metrics in my flink program.
Currently, I know we can create custom metrics with the help of RuntimeContext. 
But in my aggregate() I do not have RuntimeContext. I am using window operator and applying aggregate() method on it. And I am passing AggregateFunction in aggregate() method.

So, Kindly guide me, how can I create custom metrics in my code?

Note: As we know we can not user RichAggregateFunction with aggregate() method 

Thanks & Regards
Gaurav Luthra
Mob:- +91-9901945206