Fix documented equation for diskio average queue depth (#3334)
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@ -140,7 +140,7 @@ SELECT derivative(last("io_time"),1ms) FROM "diskio" WHERE time > now() - 30m GR
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#### Calculate average queue depth:
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`iops_in_progress` will give you an instantaneous value. This will give you the average between polling intervals.
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```
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SELECT derivative(last("weighted_io_time",1ms))/1000 from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
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SELECT derivative(last("weighted_io_time",1ms)) from "diskio" WHERE time > now() - 30m GROUP BY "host","name",time(60s)
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```
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### Example Output:
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