like side missions, that generate random robot/pack of robots that player need to take care of - and reward can be exp weapon, schematic that the player dont have yet, attachments, etc…
In the early days (just after the launch), there were remnants of daily “Bounty” missions in the game, which you could take from the Warboard, it highlighted specific machine in the region and you had to go and take it out.
This early idea/concept grew into Rival system we currently have in the game. And what you are describing IS the Rival system in the game.