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from(bucket:"testdb")
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|> range(start: 2018-05-22T19:53:26Z)
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|> filter(fn: (r) => r._measurement == "diskio" and r._field == "io_time")
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|> group(by: ["_measurement", "_start", "name"])
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|> max()
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|> map(fn: (r) => {_time: r._time, max: r._value})
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|> yield(name: "0")
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