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Update delta filter docs for new percentage mode (#2647)
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@ -456,11 +456,28 @@ values.
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``delta``
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*********
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This filter stores the last value passed through this filter and only
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passes incoming values through if the absolute difference is greater than the configured
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value. For example if a value of 1.0 first comes in, it's passed on. If the delta filter
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is configured with a value of 5, it will now not pass on an incoming value of 2.0, only values
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that are at least 6.0 big or -4.0.
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This filter stores the last value passed through this filter and only passes incoming values through
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if incoming value is sufficiently different from the previously passed one.
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This difference can be calculated in two ways an absolute difference or a percentage difference.
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If a number is specified, it will be used as the absolute difference required.
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For example if the filter were configured with a value of 2 and the last value passed through was 10,
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only values greater than 12 or less than 8 would be passed through.
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.. code-block:: yaml
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filters:
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- delta: 2.0
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If a percentage is specified a percentage of the last value will be used as the required difference.
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For example if the filter were configured with a value of 20% and the last value passed through was 10,
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only values greater than 12 or less than 8 would be passed through.
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However, if the last value passed through was 100 only values greater than 120 or less than 80 would be passed through.
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.. code-block:: yaml
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filters:
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- delta: 20%
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``or``
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******
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