That means spot checks or spot controls.

German police reintroduce spot controls at all borders – Germany is reintroducing border checks at all its borders for at least six months. The aim is to help restrict migration.
Checks are being temporarily reintroduced at Germany’s borders with France, Belgium, Luxembourg, the Netherlands and Denmark. They are due to run until March 15, 2025. Such controls have already become part of daily life at the borders with Poland, the Czech Republic, Austria and Switzerland.
Temporarily? We’ll see about that.