Get guest name and tags in disk_size and pve_up metrics

[kevin-snt]

It will be great for alerting rule to have name and tags in metrics other than guest info to make more accurate query on alerting

Thanks

[znerol]

Please use the power of PromQL to get those labels from the pve_guest_info metric. An example can be found in this comment (and the blog linked from there): #204 (comment)