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9.5. Initializing queue statistics

The queue_stats tapset provides functions that, when given notification of queuing events like wait, run, or done, track averages such as queue length, service and wait times, and utilization. Call the following three functions from appropriate probes, in sequence.

9.5.1. qs_wait
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General syntax: 
qs_wait:unknown (qname:string)
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This function records that a new request was enqueued for the given queue name.

9.5.2. qs_run
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General syntax: 
qs_run:unknown (qname:string)
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This function records that a previously enqueued request was removed from the given wait queue and is now being serviced.

9.5.3. qs_done
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General syntax: 
qs_done:unknown (qname:string)
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This function records that a request originally from the given queue has completed being serviced.
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