Before this werk, Checkmk included the agent plugin mailman_lists, which monitored Mailman
2 mailing lists. As of this werk, Checkmk includes the plugins mailman2_lists and
mailman3_lists, which monitor Mailman 2/3 mailing lists. If the bakery is configured to
deploy the Mailman plugin, both plugins will be installed, since only one of them will be
operational, depending on the Mailman version installed on the target system.
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