Proxmox VE exposes a full REST API that Linivo uses to poll node, VM and container metrics across a cluster.
Under Datacenter > Permissions > API Tokens, create a token for a dedicated user and assign it the built-in PVEAuditor role, which grants read-only visibility across the cluster.
Proxmox's API listens on 8006 by default; confirm the sensor can reach it before configuring the integration in Linivo.
curl -k https://10.20.9.5:8006/api2/json/version
Point Linivo at any one node in the cluster along with the API token; it discovers the other nodes, VMs and containers automatically rather than needing each one added by hand.