Materializes to IFlowMonitor that allows monitoring of the the current flow. All events are propagated by the monitor unchanged. Note that the monitor inserts a memory barrier every time it processes an event, and may therefor affect performance. The combine function is used to combine the IFlowMonitor with this flow's materialized value.

public static Flow<TIn, TOut, TMat2> Monitor<TIn, TOut, TMat, TMat2>(
	this Flow<TIn, TOut, TMat> flow,
	Func<TMat, IFlowMonitor, TMat2> combine
)

[<ExtensionAttribute>]
static member Monitor : 
        flow : Flow<'TIn, 'TOut, 'TMat> * 
        combine : Func<'TMat, IFlowMonitor, 'TMat2> -> Flow<'TIn, 'TOut, 'TMat2>