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docker/elk/extensions/metricbeat/README.md

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+# Metricbeat
+
+Metricbeat is a lightweight shipper that you can install on your servers to periodically collect metrics from the
+operating system and from services running on the server. Metricbeat takes the metrics and statistics that it collects
+and ships them to the output that you specify, such as Elasticsearch or Logstash.
+
+## Usage
+
+To include Metricbeat in the stack, run Docker Compose from the root of the repository with an additional command line
+argument referencing the `metricbeat-compose.yml` file:
+
+```console
+$ docker-compose -f docker-compose.yml -f extensions/metricbeat/metricbeat-compose.yml up
+```
+
+## Configuring Metricbeat
+
+The Metricbeat configuration is stored in [`config/metricbeat.yml`](./config/metricbeat.yml). You can modify this file
+with the help of the [Configuration reference][metricbeat-config].
+
+Any change to the Metricbeat configuration requires a restart of the Metricbeat container:
+
+```console
+$ docker-compose -f docker-compose.yml -f extensions/metricbeat/metricbeat-compose.yml restart metricbeat
+```
+
+Please refer to the following documentation page for more details about how to configure Metricbeat inside a
+Docker container: [Run Metricbeat on Docker][metricbeat-docker].
+
+## See also
+
+[Metricbeat documentation][metricbeat-doc]
+
+[metricbeat-config]: https://www.elastic.co/guide/en/beats/metricbeat/current/metricbeat-reference-yml.html
+[metricbeat-docker]: https://www.elastic.co/guide/en/beats/metricbeat/current/running-on-docker.html
+[metricbeat-doc]: https://www.elastic.co/guide/en/beats/metricbeat/current/index.html