How to lengthen retention of events of current Cluster?

In the Rancher Dashboard there is a “Events of current Cluster” section

I saw that they disappear after a few hours

Is it possible to lengthen the conservation of these events?

This is a Kubernetes configuration and the setting and the design considerations are in https://github.com/kubernetes/kubernetes/issues/52521

Thank you
I understand that i must configure the ttl of events as i wish by
setting the flag --event-ttl duration Amount of time to retain events. (default 1h0m0s) of kube-apiserver

how do I set that flag on Rancher?

This is described on https://rancher.com/docs/rancher/v2.x/en/faq/technical/#how-can-i-add-additional-arguments-binds-environment-variables-to-kubernetes-components-in-a-rancher-launched-kubernetes-cluster

I don’t understand the guide
I searched for the event-ttl property in the full cluster yml example, without finding it

The guide says to add properties in the extra_args section

So I modified the cluster yaml, adding the property like this:

services:
etcd:
extra_args:
event-ttl: 72h

Now the cluster is in error:

[etcd] Failed to bring up Etcd Plane: etcd cluster is unhealthy

Also, I should set this flag in kube-apiserver, but the guide only talks about extra-args