The automation agent has internal collections that it disables balancing for on a draining shard, and that it will move on its own.

This causes the following misleading error message to be logged by the balancer:
"draining of removed shard cannot be completed because the balancer is disabled for a collection which has chunks in those shards".

Unfortunately, there isn't a straightforward way to suppress this warning. We'd need to coordinate with the automation agent team to identify the relevant internal collections they handle, and then hard-code those exceptions into the balancer so it skips logging warnings for them.