monitoring: add 'location' info

templates/prometheus.yml

@@ -29,6 +29,9 @@ scrape_configs:
 {% if hostvars[host]['site'] is defined %}
           site: "{{ hostvars[host]['site'] }}"
 {% endif %}
+{% if hostvars[host]['location'] is defined %}
+          location: "{{ hostvars[host]['location'] }}"
+{% endif %}
 {% endfor %}
 
 {% endfor %}