Hi, I'm willing to help but not sure what dose `Update the message in the screenshot to always show the "causeOfBlockage" message` mean, any clarification? 

davidguandev if you disable all the executors on your Jenkins and run a Pipeline, in classic it will tell you it is waiting on nodes to come online etc. When the Pipeline is queued, there is a field called "causeOfBlockage" on the queued item (see BlueQueueItem.java) that is the string message that we want to display to the user instead of "Waiting for run to start".

davidguandev I took a look at this one - we need to get our house in order here before we can offer it under a 'newbie-friendly' labeled ticket.