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@ -504,7 +504,7 @@ See this [Tutorial](https://community.openhab.org/t/13761/1) for more details.
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**Technical constraints and details:**
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- When using rrd4j persistence, the strategy `everyMinute` (60 seconds) has to be used. Otherwise no data will be persisted (stored) and the chart will not be drawn projavay (see [rrd4j Persistence](/addons/persistence/rrd4j)).
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- When using rrd4j persistence, the strategy `everyMinute` (60 seconds) has to be used. Otherwise no data will be persisted (stored) and the chart will not be drawn properly (see [rrd4j Persistence](/addons/persistence/rrd4j)).
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- The visibility of multiple Chart objects may be toggled to simulate changing the Chart period; non-visible Chart widgets are NOT generated behind the scenes until they become visible.
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- When charting a group of item, make sure that every label is unique.
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