Here you can find several examples of SonarQube Connector Badge to see how it displays the quality metrics in a Confluence page:
Apache Struts
SonarQube™
Here we have set several badges to display size of the project, reliability rating:
JMeter
Kotlin
Here we have set several badges to display security rating, number of vulnerabilities found in the project:
Multiproject badge
Here we have set several badges to display badge using multiple projects: