This plugin checks the length of a commit's commit message subject and message body, and reports warnings to the git client if the lengths are exceeded.
The maximum lengths of the subject and message body are can be configured in the standard Gerrit config file gerrit.config.
commitmessage.maxSubjectLength : Maximum length of the commit message's subject line. If not specified, defaults to 65.
commitmessage.maxLineLength : Maximum length of a line in the commit message's body. If not specified, defaults to 70.