As only one router was used in the testing process, all metadata requests from instances were being handled by only one metadata agent that as a result couldn't process some of them due to high load.
So the recommendation here would be to create several routers to balance the load among all metadata-agents.
As only one router was used in the testing process, all metadata requests from instances were being handled by only one metadata agent that as a result couldn't process some of them due to high load.
So the recommendation here would be to create several routers to balance the load among all metadata-agents.