Graphs showing no new data

2.1.0p14
Docker container on ubuntu kubernetes cluster

Hi there,
our checkMK is not showing any new data in graphs anymore, although historic data in graphs are shown and values in tables are displayed correct. A version Update to 2.1.0p14 had no effect.
At the time, graphs stopped updating, nothing changed. Deleting hosts from the configuration and adding again and reinstallation of the agent does not solve the problem.

Has anyone an idea, what this could be?

Thanks
Stephan

grafik

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