Factorio Forums

So I just found, the logistic drones works weird. Basically I lay down concrete with them. The provider chest is full with concrete, and I have 279 drones in the system at the first picture, and 329 on the second(I add 50 with hand, wait 10 seconds, prtscn) I playing on hungarian language, but I think you got the thing. Both picture said 601 building drones missing. I think your system just stuck about 600. No matter what.
If its not clear enough, I can made a video for it, but I think you got it

Edit: The forum flip my pictures, but it doesn't matter, just mention.

The alerts time out after a while and the system only tries to send a specific amount of robots each game tick. That results in some "upper" number that the alert will ever show before the first one it made timed out and before the next time it tries to send robots.

The alerts for "not enough robots" just happen to time out after 600 game ticks. If you don't have enough robots the game will try to send 1 robot each tick to build stuff, see it has no robots, generate an alert, and then stop trying until the next game tick. That would result in a count of "not enough" roughly at what you're seeing

Unless you can provide a 1-1 robot <> thing-to-be-built chances are you'll see that alert number show up as the system that sends robots send them far faster than they can actually build the things they're told to build.