Perhaps it is becomes load balancer and worker(docker container with Shiny server) are in the same server with only 4 cores.
There are 30 shiny containers as workers. It is likely 4 of them are at 100% running. Nginx won't be able to get CPU to handline traffic.
Perhaps it is becomes load balancer and worker(docker container with Shiny server) are in the same server with only 4 cores. There are 30 shiny containers as workers. It is likely 4 of them are at 100% running. Nginx won't be able to get CPU to handline traffic.
Temp. solution: