The Looker platform has an endpoint for the production model to run a git pull from the repository.
Normally, this is automatically done when a Looker developer pushes changes. However, if LookML is being worked on or generated from another source, then Looker’s LookML can get out of sync with the repository. To re-sync a project, open the following URL in a new tab in your browser:
Here [hostname] is your Looker URL and [project name] is the name of the project you want to sync.
When you run this, you’ll get a white screen with a success message.
Nothing to worry about, just navigate back to your instance and see the updated LookML.