[prometheus] Sort server list

monitoring.yml

@@ -5,7 +5,7 @@
     # Prometheus targets.json
     prometheus_targets:
       - labels: {job: node}
-        targets: "{{ groups['crans'] | map('replace', '.org', '.org:9100') | list }}"
+        targets: "{{ groups['crans'] | map('replace', '.org', '.org:9100') | list | sort }}"
       - labels: {job: prometheus}
         targets: ['localhost:9090']
     prometheus_ups_snmp_targets: