Rockstar has temporarily removed the Rooftop Rumble mission from Grand Theft Auto Online to fix an issue.
“We are currently working on fixing an issue with Rooftop Rumble, and expect it to be available again within the next week. Apologies for any inconvenience,” the developer wrote on its support page in response to a question.
The issue in question appears to be related to a glitch that allows players to finish the mission in less than a minute and receive the full complement of RP and money. The mission can then be replayed as many times as players desire.