This report ranks search engines by the number of visitors you receive from them. For each search engine, there is information about the search queries that gave users a link to your site in search results.
Yandex.Metrica uses the referrer to identify this source. You can also define the traffic source by forming a URL with UTM tags. In this case, you must correctly specify the utm_source and utm_medium parameters.
Set the value of the utm_source parameter as:
If the UTM tag specifies a different value for the utm_source parameter that isn't listed above, Yandex.Metrica identifies the traffic source from the organic value for the utm_medium parameter. In the report, these sessions will be assigned to the source Other search engine: determined by tags.