Add "job: node" label to node_exporter jobs

node_exporter/templates/scrape.yml.j2

 - targets:
   - "{{ ansible_fqdn }}:9100"
+  labels:
+    job: node

prometheus/templates/prometheus.yml.j2

@@ -20,6 +20,7 @@ scrape_configs:
         - 'localhost:9090'
 
   - job_name: dynamic_scrapers
+    honor_labels: true
     file_sd_configs:
       - files:
         - /etc/prometheus/scrape/*.yml