some fixes in iot role

roles/iot/tasks/influx.yml

     group=root
   notify: restart telegraf
 
+- name: Set firewall rules for InfluxDB
+  ufw: rule=allow port={{ item }} proto=tcp
+  with_items:
+    - 8086  # http
+    - 8088  # rpc
+  tags: ufw
+
 - name: Register new InfluxDB and Telegraf service
-  systemd: name={{ item }} daemon_reload=yes enabled=yes
+  systemd: name={{ item }} daemon_reload=yes enabled=yes
   with_items:
     - influxdb
     - telegraf
 
 - name: Start new InfluxDB and Telegraf instance
-  service: name={{ item }} state=started
+  service: name={{ item }} state=started
   with_items:
     - influxdb
     - telegraf

roles/iot/templates/etc_apache2_sites-available_grafana.j2

 <VirtualHost *:80>
     ServerName {{ grafana_subdomain }}.{{ item.name }}
+    ServerAlias {{ grafana_subdomain }}
 
     Redirect temp / https://{{ grafana_subdomain }}.{{ item.name }}/
 </VirtualHost>
 
 <VirtualHost *:443>
     ServerName {{ grafana_subdomain }}.{{ item.name }}
+    ServerAlias {{ grafana_subdomain }}
 
     SSLEngine               On
     DocumentRoot            "{{ item.doc_root }}"

roles/iot/templates/etc_telegraf_telegraf.j2

   ## If true, collect raw CPU time metrics.
   collect_cpu_time = false
   ## If true, compute and report the sum of all non-idle CPU states.
-  report_active = false
+  report_active = true
 
 
 # Read metrics about disk usage by mount point
 
 
 # # Read metrics about network interface usage
-# [[inputs.net]]
-#   ## By default, telegraf gathers stats from any up interface (excluding loopback)
-#   ## Setting interfaces will tell it to gather these explicit interfaces,
-#   ## regardless of status.
-#   ##
-#   # interfaces = ["eth0"]
-#   ##
-#   ## On linux systems telegraf also collects protocol stats.
-#   ## Setting ignore_protocol_stats to true will skip reporting of protocol metrics.
-#   ##
-#   # ignore_protocol_stats = false
-#   ##
+[[inputs.net]]
+  ## By default, telegraf gathers stats from any up interface (excluding loopback)
+  ## Setting interfaces will tell it to gather these explicit interfaces,
+  ## regardless of status.
+  ##
+  # interfaces = ["eth0"]
+  ##
+  ## On linux systems telegraf also collects protocol stats.
+  ## Setting ignore_protocol_stats to true will skip reporting of protocol metrics.
+  ##
+  # ignore_protocol_stats = false
+  ##
 
 
 # # Collect response time of a TCP or UDP connection