How to obtain the SonarQube project URL in Jenkins pipeline?

You can use env var SONAR_HOST_URL inside the sonar block, like this:

withSonarQubeEnv('my-sonar') {
    def sonar_host_url = env.SONAR_HOST_URL
    echo '${env.SONAR_HOST_URL}'
    // my-sonar.example.com
}

from : https://stackoverflow.com/questions/57471986/how-to-obtain-the-sonarqube-project-url-in-jenkins-pipeline