42. Unchanged Datum Filter¶
The Unchanged Datum Filter provides a way to discard entire datum that have not changed within a datum stream.
This filter is provided by the Standard Datum Filters plugin.
Tip
See the Unchanged Property Filter for a filter that can discard individual unchanging properties within a datum stream.
42.1 Settings¶
In addition to the Common Settings, the following general settings are available:
| Setting | Description |
|---|---|
| Unchanged Max Seconds | When greater than 0 then the maximum number of seconds to refrain from publishing an unchanged datum within a single datum stream. Use this setting to ensure a datum is included occasionally, even if the datum properties have not changed. Having at least one value per hour in a datum stream is recommended. This time period is always relative to the last unfiltered property within a given datum stream seen by the filter. |
| Property Pattern | A property name pattern that limits the properties monitored for changes. Only property names that match this expression will be considered when determining if a datum differs from the previous datum within the datum stream. |