better comment.
Fixing obscure NPE
Retrying MatrixBuilds but not MatrixRuns.
Adding an action to track the downstream builds an upstream build triggers.
Also: adding the ability to only trigger and not wait for the build by not setting an variable name.
updating jenkins version to latest LTS
using QueueTaskFuture
Keep down the wait chatter.
Not logging every time we poll makes the code and the logs a lot cleaner.
adding a summary section to the build page listing all the downstream jobs.
adding summary