The cppcheck plugin in Jenkins displays the following text for for severity reporting configuration:
"Configure the build status and health. A build is considered as unstable or failure if the new or total number of errors exceeds the specified thresholds. The build health is also determined by thresholds. If the actual number of errors is between the provided thresholds, then the build health is interpolated.
severiry.evaluation Severity 'error' Severity 'warning' Severity 'style' Severity 'performance' Severity 'information' "
"severiry.evaluation" should be severity.evaluation