stage('stats') {
    def tag = sh(returnStdout: true, script: "git tag --contains").trim()
    echo 'checking node and npm versions'
    sh 'node -v'
    sh 'npm -v'
    sh 'ls -a'
    sh 'df -h'
    sh 'free -m'
    if (tag) {
      currentBuild.displayName = "#${BUILD_NUMBER}, tag${tag}"
    } else {
      currentBuild.displayName = "#${BUILD_NUMBER}, branch ${BRANCH}"
    }
    currentBuild.description = "#${BUILD_NUMBER}, branch ${BRANCH}, tag${tag}"
    // sh 'vmstat -s'
}