Content pack installed but no data show in dashboard

[a2940uw]

Hi, I have a mailcow-dockerized installed and following the mailcow documentation site to setup the log file send to a separate Graylog appliance working properly, I can see the Graylog success to received and show the log message in the input menu, when I installed the mailcow content pack, but I can't see the date shown in the mailcow dashboard, would you provide more hints for the configuration.

[greenmoss]

Check your "streams" page: your-graylog/streams. The streams are all configured to look for container_name prefix of mailcowdockerized. In my case, the prefix is mc, so none of the rules match. It looks like the dashboard also has the prefix hard-coded.