Configure Telegraf to monitor Docker containers

Added configuration to ansible/roles/telegraf/templates/telegraf.conf.j2 to
allow telegraf to grab telemetry data from docker directly.

Added option to etc/kolla/globals.yml to switch on/off the configuration to
ingest data from the docker daemon into telegraf.

Change-Id: Icbebc415d643a237fa128840d5f5a9c91d22c12d
Signed-off-by: Keith Plant <kplantjr@gmail.com>

ansible/group_vars/all.yml

@@ -1062,3 +1062,10 @@ distro_python_version_map: {
 }
 
 distro_python_version: "{{ distro_python_version_map[kolla_base_distro] }}"
+
+##########
+# Telegraf
+##########
+# Configure telegraf to use the docker daemon itself as an input for
+# telemetry data.
+telegraf_enable_docker_input: "no"

ansible/roles/telegraf/templates/telegraf.conf.j2

@@ -108,3 +108,16 @@
   gather_perf_events_statements             = true
   interval_slow                             = "30m"
 {% endif %}
+{% if telegraf_enable_docker_input | bool %}
+[[inputs.docker]]
+  endpoint = "unix:///var/run/docker.sock"
+  gather_services = false
+  container_names = []
+  container_name_include = []
+  container_name_exclude = []
+  timeout = "5s"
+  perdevice = true
+  total = false
+  docker_label_include = []
+  docker_label_exclude = []
+{% endif %}

etc/kolla/globals.yml

@@ -585,3 +585,10 @@
 # by kolla-ansible. You must first setup an external elasticsearch with 2.3.0.
 # By default, kolla-ansible deployed mariadb is the used database backend.
 #freezer_database_backend: "mariadb"
+
+##########
+# Telegraf
+##########
+# Configure telegraf to use the docker daemon itself as an input for
+# telemetry data.
+#telegraf_enable_docker_input: "no"