post {        
always {             
 sendSlack(null, null,currentBuild.currentResult)        
}        
success {            
 echo 'This will run only if successful' cleanup()        
}        
failure {            
 echo 'Notify developer when build failure'  printDebug()         
}        
unstable {            
 echo 'This will run only if the run was marked as unstable' cleanup()        
}        
changed {            
 echo 'This will run only if the state of the Pipeline has changed'            
 echo 'For example, the Pipeline was previously failing but is now successful'      }
}