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How many managers in the local cluster? You talking about Rancher instances?

Yes, how many managers in the local cluster

You can't run more than one rancher instance in a cluster

Yes, we have one local k3s cluster with 3 managers running Rancher, and then in prod just one RKE cluster in Rancher

What do you mean by "managers", exactly?

Sorry, yes 3 manager nodes

Rancher can reside on a 3 node cluster. The spec of those nodes determine how many downstream clusters it can manage

Each manager node is an AWS instance with 2 cpus and 8G of RAM, the RAM is usually pegged around 65% on each node. We will most likely only ever have one downstream cluster, but that cluster itself has about 120 nodes including 3 etcd nodes, 2 controlplanes, and lots of workers. We've had 3 manager nodes for quite some time but we're growing, wasn't sure if 5 was overkill with those specs

https://ranchermanager.docs.rancher.com/pages-for-subheaders/installation-requirements#k3s-kubernetes Scale up, not out

Ok cool, so bigger nodes not more. I doubt we'll hit 1500 nodes in our RKE cluster so our current architecture should be good then? We are in an air-gapped environment and I'm trying to rule out things when we have performance issues, sounds like we're good re: the local cluster, thanks for the help