Histograms not rendering after upgrade to 8.13.4

After upgrading to 8.13.4 from 8.11.3 all histograms are failing to render. There is simply a red line that keeps scrolling across the top of the visualization, similar to the spinning hourglass when Windows is being slow.

This is happening not only with custom visualizations but also with dashboards provided by Elastic Agent integrations. We are on the most recent version of the integrations. An example is the "[Elastic Agent] Integrations" dashboard where the "[Elastic Agent] Events per Integration" graph fails to render and the scrolling red line is shown. This is also happening in 'Discover' with the graph of event counts over the time period in question.

This is happening on multiple clusters, ranging in size from 50+ TB of data down to a small 700GB cluster. No errors are shown in either the elasticsearch nor kibana logs. The search rate on the elasticsearch servers doesn't seem to change during the attempted rendering, almost like requests aren't even being made to the cluster.

Changing the visualizations to something other than a date histogram shows the data that should be displayed, just not in a histogram format, so I don't believe this is an issue with locating the data. The @timestamp field is being used for the histogram.

I don't see anything in the 8.12 or 8.13 release notes about a breaking change that would cause this.

Any ideas on how to get histogram visualizations working again?

Hi @twilson

To clarify, are all your visualizations just loading indefinitely or just taking longer time to load?

They just load indefinitely.

This appears to be an issue with my browser. This morning I tested with different browsers and the graphs all rendered properly. Not sure why I didn't do this yesterday.