'analytics event label is missing

I have problem with sending event to Google Analytics. In some cases the event label is empty. I can see the label in fiddler.

The category and action are always saved. It seems as if it happens to label that are sent in low numbers. Is there a limitation in Google analytics that it omits the label if the count to that label is relatively low and there is a lot of other traffic? My site has a lot of traffic, millions of events per day



Solution 1:[1]

Once the number of data points crosses a certain threshold (depending on the report type) , GA uses sampled data to reduce the load on their servers.

To see if a report is sampled, look for a checkerboard-like icon in the upper right corner of the interface. You can click this to access a slider to increase the amount of data in a sample, but only to a certain point.

Check to see if your reports are being sampled. If so, it may well be that a label with a small number of data points gets totally overlooked and therefore shows up as zero in the sampled report.

If this is indeed your problem, you can decrease the date range until you no longer see the sampling icon.

Solution 2:[2]

Yes, in G4 they are now missing. These are user fields (self made). Also missing browser version. What a shame for Google.

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Sources

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Source: Stack Overflow

Solution Source
Solution 1 Greg
Solution 2