Google posted a notice that between the dates of June 5 through June 7, it was unable to capture data around image search traffic. This is just a reporting bug and did not impact actual search traffic, but the Search Console performance report may show drops in image search traffic in that date range.
The notice. The notice read, “June 5-7: Some image search statistics were not captured during this period due to an internal issue. Because of this, you may see a drop in your image search statistics during this period. The change did not affect user Search results, only the data reporting.”
How do I see this? If you login to Google Search Console, click into your performance report and then filter by clicking on the “search type” filter. You can then select image from the filters.
Here is a screen shot of this filter:
Why we should care. If your site gets a lot of Google Image search traffic, you may notice a dip in your traffic reporting within Google Search Console. You may have not noticed a similar dip in your other analytics tools. That being said, Google said this is only a reporting glitch within Google Search Console and did not impact your actual traffic to your web site.