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SELECT time, (memUsed / procTotal / 1000000) as value
FROM measurements
WHERE time > now() - '1 hour';

// Memory used (in bytes)
memUsed = from(bucket: "telegraf/autogen")
  |> range(start: -1h)
  |> filter(fn: (r) =>
    r._measurement == "mem" and
    r._field == "used"
  )
// Total processes running
procTotal = from(bucket: "telegraf/autogen")
  |> range(start: -1h)
  |> filter(fn: (r) =>
    r._measurement == "processes" and
    r._field == "total"
    )
// Join memory used with total processes and calculate
// the average memory (in MB) used for running processes.
join(
    tables: {mem:memUsed, proc:procTotal},
    on: ["_time", "_stop", "_start", "host"]
  )
  |> map(fn: (r) => ({
    _time: r._time,
    _value: (r._value_mem / r._value_proc) / 1000000
  })
)