[atlas] [User Defined Measurements] status settings

In the context of your research, you could view “failed” and “no 
suitable probes” as finished, but here is a complete list of possible 
measurement statuses:

  * *Specified*: the measurement has been defined and sent to our
    infrastructure to be relayed to the probes.
  * *Scheduled*: The measurement has been relayed to the probes. If the
    start time is immediate, this status doesn’t last very long.
  * *Ongoing*: The measurement is running on available probes.
  * *Stopped*: The measurement was stopped either on schedule, by the
    user requesting an early stop.
  * *Forced to Stop*: The measurement was killed prematurely due to a
    lack of available credits.
  * *No suitable probes*: The measurement cannot currently be executed
    as defined due to a lack of available probes. This may be because
    you asked to use probes that don’t exist (for example, probes in an
    AS in which there are no probes) or because all of the probes you
    requested were too busy to take on new jobs. This latter scenario is
    very rare however.
  * *Failed*: If a probe never actually runs a single measurement over
    the duration of the specified start/stop time (typically due to a
    lack of available probes), it will be marked as |Failed| once the
    stop time has been reached.

In other words, |Specified|, |Scheduled|, |Ongoing|, and |No suitable 
probes| are statuses potentially assigned to running measurements (or at 
least those who may return results at some point), while |Stopped|, 
|Forced to Stop|, and |Failed| are statuses assigned to measurements 
that will not be returning any more results.

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