🐳 Add telegraf container for Docker metrics in influxdb

All our hosts running docker can put their metrics into our influxdb
now.

Note: not all docker hosts do this (yet), because the influxdb is
currently only reachable from within the local space internal network in
our rooms.

Link: https://docs.ansible.com/ansible/latest/inventory_guide/intro_patterns.html
Link: https://galaxy.ansible.com/lespocky/telegraf_docker_in_docker
References: #760

group-docker_host.yml

@@ -4,3 +4,17 @@
 
   roles:
     - role: docker_setup
+
+- hosts: docker_host:&location_space
+  become: true
+
+  roles:
+    - role: lespocky.telegraf_docker_in_docker
+      vars:
+        tdid_conf_dir: "/etc/telegraf"
+        tdid_influxdb_org: "{{ influxdb_org }}"
+        tdid_influx_token: "{{ vault_tdid_influx_token }}"
+        tdid_docker_image: "telegraf:1.24-alpine"
+        tdid_influxdb_url: "https://influx.n39.eu"
+        tdid_influxdb_bucket: "system_metrics"
+        tdid_timezone: "{{ timezone }}"

group_vars/docker_host/vault

@@ -0,0 +1,11 @@
+$ANSIBLE_VAULT;1.1;AES256
+32316530363561636236376162663963643966336566373964633066326365373234323365376635
+3032376339633462623762313638303066306637323630660a323839333935643761313534646631
+64303438376132303461363664653239373663323433343331363833373331666532303538306433
+3766633837323238320a383461616434326531613532323463393939333331306264663765393761
+35336332336135623834373661323535376264323564383234633435373363343739316234653631
+32336663636632386131316165663766643935633562353235633937666264326537323362633864
+32386264643539356430353837663761356561386162306466643838303462353631346564653432
+33356266666466333132636364643962383030313264336363356439663066346462653466343163
+38666537306464323434366135333433623335396239636461353136663563323934653737336337
+3664393331316162303938626330643137653232653263366461

requirements.yml

@@ -10,6 +10,8 @@ roles:
     version: v1.0.0
   - src: git+https://github.com/maz3max/ble-keykeeper-role.git
     version: v1.1.0
+  - src: lespocky.telegraf_docker_in_docker
+    version: v0.2.0
 
 collections:
   - name: community.grafana