Requires Proxmox 4.0 or later.
Note: I didn't have any containers running when I made the associated screen shot.
Configure Proxmox to talk to your InfluxDB as per https://pve.proxmox.com/wiki/External_Metric_Server then point this dashboard at the resulting database.
Since Grafana doesn't allow setting limits from a query, this dashboard assumes an 8 core processor and 32GB or ram. If your Proxmox host is different you may have to tune various guages and limits to appropriate values.