With the newer pipeline stage view plugin versions (1.7 & 2.0) the small labels which used to display on which agent a stage was executed are gone.
This information used to be very useful for us. Hope it was not removed by purpose.

Please check the attached screen shots for an example. Unfortunately I had to remove the slave name in the picture for stage view V1.4

Pipeline itself is rather simple:

stage('first') {
    node('test') {
        stage('node') {
            println 'test'
        }
    }
}

or:

stage('first')
node('test') {
    stage('node')
    println 'test'
}