telegraf: Double batch size & use alpine image

This may fix some timing issues with sending the data within the interval & the alpine image is way smaller.

roles/telegraf/defaults/main.yml

@@ -27,7 +27,7 @@ telegraf_config_location: "{{ telegraf_install_location }}/conf"
 telegraf_version: "1.17.3"
 # renovate: depName=quay.io/sheogorath/docker-socket-proxy
 telegraf_dockersocketproxy_version: "2.3"
-telegraf_image_version: "{{ telegraf_version }}"
+telegraf_image_version: "{{ telegraf_version }}-alpine"
 
 # The influxdb endpoints, telegraf should send data to
 telegraf_influxdb_endpoints:
@@ -49,7 +49,7 @@ telegraf_agent_round_interval: true
 telegraf_agent_flush_interval: 10
 telegraf_agent_flush_jitter: 5
 telegraf_agent_collection_jitter: 5
-telegraf_agent_metric_batch_size: 1000
+telegraf_agent_metric_batch_size: 2000
 telegraf_agent_metric_buffer_limit: 1000000
 telegraf_agent_omit_hostname: False
 
@@ -70,6 +70,7 @@ telegraf_output:
 
 # The telegraf input plugins that are enabled by default (see https://docs.influxdata.com/telegraf/v1.15/plugins/plugin-list/)
 telegraf_plugins:
+  - plugin: internal
   - plugin: cpu
     config:
       - percpu = true