Hey there.
Based on the logs, you’re using GitHub - gabrie-allaigre/sonar-gitlab-plugin: Add to each commit GitLab in a global commentary on the new anomalies added by this commit and add comment lines of modified files, which is not supported on recent versions of SnarQube.
The functionality (Merge Request Decoration) that it started to provide has been natively built into SonarQube Developer Edition since v8.0.