added #3

Author: ElazarK

articles/defender-for-cloud/defender-for-containers-introduction.md

@@ -157,6 +157,8 @@ There are three triggers for an image scan:
 
 The scan typically completes within 2 minutes, but it might take up to 40 minutes. For every vulnerability identified, Defender for Cloud provides actionable recommendations, along with a severity classification, and guidance for how to remediate the issue. 
 
+The Defender profile, or extension is used to detect running images. The scan will run every 7 days, indefintely, as long as the image is running.
+
 Defender for Cloud filters and classifies findings from the scanner. When an image is healthy, Defender for Cloud marks it as such. Defender for Cloud generates security recommendations only for images that have issues to be resolved. By only notifying when there are problems, Defender for Cloud reduces the potential for unwanted informational alerts.
 
 :::image type="content" source="./media/defender-for-containers/recommendation-acr-images-with-vulnerabilities.png" alt-text="Sample Microsoft Defender for Cloud recommendation about vulnerabilities discovered in Azure Container Registry (ACR) hosted images." lightbox="./media/defender-for-containers/recommendation-acr-images-with-vulnerabilities.png":::