Merge branch 'telegraf' into 'master'

Telegraf

See merge request hpc-team/ansible_cluster_in_a_box!263

roles/telegraf/templates/telegraf.conf.j2

@@ -11,6 +11,9 @@
 
 # Global tags can be specified here in key="value" format.
 [tags]
+  hostgroup = "{{ hostgroup | default('undefined') }}"
+  cluster = "{{ clustername | default('undefined') }}"
+  computenodeclass = "{{ computenodeclass | default('undefined') }}"
   # dc = "us-east-1" # will tag all metrics with dc=us-east-1
   # rack = "1a"