Ballpark value of vector_utilization metric to consider vector is choked

[ShahroZafar]

Vector have a metric named vector_utilization. We have a system which is very critical for which we are reading logs and cannot lose logs.
We want to get alerted when vector is lagging behind / fully choked and is applying backpressure. At what value of this metric should we consider that vector is working slowly and something needs to be done

[jszwedko]

A value close to 1 indicates that a component is a likely bottleneck since that indicates that the component is never waiting for input.