How to enable telemetry
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To enable telemetry logging for a user, create a directory on disk for
that user. Cyrus will automatically write logging information to this
directory for all new connections. You don't need to restart Cyrus;
closing the mail client and restarting it will do the trick.

The directory path is:

   mkdir $configdirectory/log/$userid/             # for example /var/imap/log/darth
   chown cyrus $configdirectory/log/$userid/       # The cyrus user needs write access to this directory.

If you have virtdomains enabled, then the username is the login name.
In this case if you login as "darth@vader.net", then the path is
"/var/imap/log/darth@vader.net/"

The folder will contain files called "imapd-$pid", e.g. imapd-12345.
It might also have pop3 files, httpd files, one for each daemon.  The
first part of the name is the service name from cyrus.conf(5).

Warning:

  These log files won't contain passwords, but may contain other
  confidential user data such as the content of emails. Check them
  before sharing publicly!