Here you can find several examples of SonarQube Connector Badge to see how it displays the quality metrics in a Confluence page:

WebGoat

Here we have set two badges to display size of the project and reliability rating:

11.831

Lines of Code

E

Reliability Rating

Your project

Here we have set two badges to display security rating and the number of vulnerabilities found in the project:

A

Security Rating

0

Vulnerabilities