If you have installed and configured influxDB and did set influxDB as default persistence it should show the persisted values. Having only a single persistence migth not set the default!
thanks a lot for your answer. After a lot of reading, i think i understand persistence in OH3 a litte bit better.
But there remains one thing: Why is the graph not working any more? As i understood, rrd4j stores by default the state of my item Solarheizung, but the ON-State is not displayed (See image above).
I don’t see why it should. Have you looked to see what your default is actually set to? It’s a user configurable system setting, but I’m not sure where you find it in MainUI.
You don’t have to rely on the default, you can tell your sitemap Chart widget which service to use.
What i’ve done: I’ve removed influxdb via apt → The graphs disappears and in the log are errors, that there are not values. After installing influxdb again, the diagrams are displayed. This brings me to the conclusion, that the data from influxdb is used.
This doesn’t change anything: There is only a zero line, but the item changed in this persiod several times from on to off.