How to add additional information to your wiki pagehttps://pve.proxmox.com/wiki/External_Metric_Server ?

this page is autogenerated from our reference docs: https://pve.proxmox.com/pve-docs/
if you want to change something there, you'd have to send a patch for the docs:
https://git.proxmox.com/?p=pve-docs.git;a=summary
https://pve.proxmox.com/wiki/Developer_Documentation

though i am not sure that it makes sense to add this information since its not really pve specific, but rather a feature of victoriametrics
Check this link https://grafana.com/grafana/dashboards/13307 and you will see that this is a popular dashboard which Proxmox users use to monitor their Hypervisors and maybe it will be interesting for partnership.