In terms of the following PR https://github.com/jenkinsci/workflow-basic-steps-plugin/pull/100 and this issue https://issues.jenkins-ci.org/browse/JENKINS-59776 the quiet option was added to the waitUntil instruction. This really helps in case you wait for something for a long time. But this doesn't resolve the problem fully. It still spams logs with the following output
And it still really spams up the flowGraphTable "Pipeline Steps" view with these blocks.
This needs to be resolved to be silent