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Have you read all the docs?
Have you read all the docker mongo docs?
Did you read the release notes BEFORE upgrading and do what they told you? If you didn’t breakages may occur.
….and workspaces must upgrade to MongoDB 8.2 before moving to Rocket.Chat v8.0.0, with a full backup strongly recommended.
Think that is quite clear?
Have you got good backups? You may need them.
Full text here.