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The minimum amount of oscillations required for the values to be flagged as oscillating. For example if the following pattern is found: high, low, high, low, this would be considered to be 1,5 oscillations. 

validationFlag

Optional attribute to configure the validation flag that should be set for values in the oscillation period. When this validationFlag is not configured, only the oscillation flag source will be added to these values, and the flag will remain unchanged. Use this attribute when you want to set the flag of the values to doubtful or unreliable.

Example:

<validationRuleSet validationRuleSetId="OscillationSimpleTest" timeZone="GMT">
   <oscillation validationFlag="doubtful">
      <minDifference constantLimit="0.3"/>
      <maxPeriod constantLimit="259200"/> <!-- 3 days -->
      <minOscillations constantLimit="2.5"/>
   </oscillation>
   <timeSeriesSet>
      ...
   </timeSeriesSet>
</validationRuleSet>

<validationRuleSet validationRuleSetId="OscillationAttributes" timeZone="GMT">
   <oscillationFunctions validationFlag="doubtful">
      <minDifference constantLimit="@MIN_DIFF@"/>
      <maxPeriod constantLimit="@MAX_PERIOD@"/> <!-- 3 days -->
      <minOscillations constantLimit="@MIN_OSC@"/>
   </oscillationFunctions>
   <timeSeriesSet>
      ...
   </timeSeriesSet>
</validationRuleSet>

flagSources

Since version 2012.01 FEWS stores not only the quality flags, but also the source of the flag, the so-called flagSource. So the user is able to see why a certain value is validated as unreliable, eg. due to exceeding of the hard max.
The list of flagSources is:

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