What are the metallic loops on the sides of a connector for?

The mating half of that connector is designed so that the loops can clip into place and thus you have a connector pair that is more resilient to vibration and general movement i.e. the two halves are held together this way without relying on electrical contact pressure.

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They are retention clips to ensure the connector doesn't get yanked out or fall out. If you look at the other header you will see a slot where the clip will fit.

This kind of thing is common in older connectors (though the side screws are more common) that didn't have a internal spring providing the interference fit.

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Connector