Puppet 4.9.1 has been released. This is a gem-only release for Puppet, that contains a single bug fix.
If you installed the Puppet 4.9.0 gem and use a Puppet module generated by puppet-module-skeleton, or use a CI job (such as Travis or a github repo) that may have installed it automatically, you may need to upgrade to Puppet 4.9.1.
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Jorie Tappa
Technical Documentation