I just set up a new Jenkins and was checking out how the load was during our nightly builds, when I noticed that the graph is missing 2 executors. Playing with shutting down the slaves it appears to be the executors on the master that are not included in the graph.

I am showing the graph for the whole installation, not for any specific node. I must say that checking the graph for the master only actually does show 2 executors!

Please check the attached screenshots. On the screenshot with the running project, you can actually see the graph is going down – this also made me think that Jenkins is not calculating the master executors.