Cannot use Unix socket for MongoDB!

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Found solution! https://jira.mongodb.org/browse/NODE-2158?focusedCommentId=2414954&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-2414954

And Rocket.Chat can pass options to the driver from an environment variable: https://rocket.chat/docs/installation/manual-installation/mongo-options/#passing-extra-options-to-the-mongo-driver

So all you’d need to do is add the environment variable MONGO_OPTIONS='{"useUnifiedTopology": true}'.

Although I already worked around this issue by using an lxc container. But maybe it will be helpful for someone else.