To gather more information, in the leader node, get the list of running modules:
loginctl list-users
A loki1 should be among them. Check the status of Loki, which is the backend of the System logs page; it collects logs from all cluster nodes.
runagent -m loki1 systemctl status --user loki-server
runagent -m loki1 podman ps
Then check the status of the node promtail.service, which is a service running on every node; it sends the node journal to the central Loki instance.
systemctl status promtail
The system journal can still have some information
journalctl _UID=$(id -u loki1)
journalctl -u promtail.service
More log insights: Logs | NS8 dev manual