Contextual keyword targeting is available only to direct marketer, agency, or trading desk users of Display & Video 360.
Use the Keyword report to see how well your line items performed based on the contextual keywords they targeted.
This report looks at all the keywords you've targeted your line items to, and groups your impressions, clicks, and conversions by each keyword. For example, if you targeted the keyword "mittens," you can see how many impressions, clicks, and conversions occurred as the result of serving a line item targeted to the "mittens" keyword.
Please note this report requires that you've already targeted your line items to keywords. Excluded keywords (sometimes called "negative keywords") won't be included in this report.
What can I measure?
You can measure the performance of your keywords by using a large selection of metrics, such as impressions, clicks, conversions, and so on.