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To add tags to a Databricks workspace and ensure they propagate to all cloud resources created for or by the workspace, log in to your Databricks workspace and navigate to the workspace settings or administration console. Use the tag interface to add custom tags, which will be applied to workspaces, compute resources, and other objects managed by Databricks. Tags will automatically propagate to usage logs and cloud resources like AWS EC2 and EBS instances, helping you track costs and manage resources efficiently within your Databricks workspace.