The unzip step logs for every file extracted, which can clutter up the console (similar to JENKINS-14541). It would be nice if it took an argument to reduce verbosity. Maybe just a one-line log message reporting how many files were extracted, after the initial Extracting from: message.

Currently if I have a big ZIP and do the following

node {
  unzip( zipFile: 'biggy.zip', dir: 'over/there' )
}

Then it could yield hundreds of lines after the initial message like

Extracting: somefile -> c:\jenkins_agent\workspace\cool-job\over\there\somefile
 .
 .
 .