Looker Self-Hosting Knowledge Share

Hi All, we have customer-hosted looker cluster. Currently we have an issue with one overloaded node and I’m trying understand how Looker distribute workload but can’t find any information about it. I can see in looker UI one node market as “Master” but what it’s mean, does master distribute workload? Where can I see this distribution statistic? Does “Master” split user request between nodes or direct all one user requests to one node? How can I monitor distributed by nodes task to prevent nodes bad distribution?