@ruflin
Apparently something went wrong while upgrading metricbeat on the index. I stopped all my metricbeat agents. Deleted the metricbeat index and all the metricbeat saved objects and index pattern. Then reloaded the template metricbeat setup --template and dashboards --dashboards on one of the agents. All is working now. This was a dev cluster btw. Thanks for your help! It got me investigating the right path.
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