Events received Rate expression using metricbeat on Timelion


I wanna draw Events received Rates per second on Kibana timelion using metricbeat :slight_smile:

Is this right expressions for this purpose?

q='event.module:kafka AND _exists_:kafka.partition.offset.newest',
metric='avg:event.duration').multiply(0.000000001).label('Duration(sec) of Newest Events') 

I'm curious about the common field event.duration of metricbeat.
Is this duration of events received on kafka(or each modules) or metricbeat side ?

It's ambiguous in the documentation:

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