CMK version: 2.1.0p11
After upgrade from 2.0.0p19
Error message: Dashlet type ‘alert_statistics’ could not be found. Please remove it from your dashboard configuration.
Your Checkmk version is ancient. Even Checkmk 2.1.0 is reaching end of life at the end of this week. You should really update quickly. Apart from that it might make sense to share a screenshot, so people can get better context on the topic.
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