APM extension: update path to apm-server config

extensions/apm-server/README.md

 # APM Server extension
 
-Adds a container for Elasticsearch APM server. Forwards caught errors and traces to Elasticsearch
-server that can be viewed in Kibana. 
+Adds a container for Elasticsearch APM server. Forwards caught errors and traces to Elasticsearch to enable their
+visualisation in Kibana.
 
 ## Usage
 
-If you want to include the APM server, run Docker compose from the root of 
-the repository with an additional command line argument referencing the `apm-server-compose.yml` file:
-                                                                           
-```bash
+If you want to include the APM server, run Docker Compose from the root of the repository with an additional command
+line argument referencing the `apm-server-compose.yml` file:
+
+```console
 $ docker-compose -f docker-compose.yml -f extensions/apm-server/apm-server-compose.yml up
 ```
 
 ## Connecting an agent to APM-Server
 
-The most basic configuration to send traces to apm server. Is to specify the
-`SERVICE_NAME` and `SERVICE_URL`. Here is an example Python FLASK configuration: 
+The most basic configuration to send traces to APM server is to specify the `SERVICE_NAME` and `SERVICE_URL`. Here is an
+example Python FLASK configuration:
 
 ```python
 import elasticapm
@@ -36,19 +36,19 @@ app.config['ELASTIC_APM'] = {
 }
 ```
 
-More configuration setting can be found under the **Configuration**
-section for each language. Link: https://www.elastic.co/guide/en/apm/agent/index.html 
+More configuration settings can be found under the **Configuration** section for each language:
+https://www.elastic.co/guide/en/apm/agent/index.html
 
-## Checking Connectivity and Importing default APM Dashboards
+## Checking connectivity and importing default APM dashboards
 
-From Kibana main window press:
+From the Kibana Dashboard:
 
-1. `Add APM` button under Add Data to Kibana section
+1. `Add APM` button under _Add Data to Kibana_ section
 2. Ignore all the install instructions and press `Check APM Server status` button.
 3. Press `Check agent status`
 4. Press `Load Kibana objects` to get the default dashboards
 5. Lastly press the `APM dashboard` to the bottom right.
 
-## APM Agent Documentation
+## See also
 
-Link: https://www.elastic.co/guide/en/apm/agent/index.html
+[Running APM Server on Docker](https://www.elastic.co/guide/en/apm/server/current/running-on-docker.html)

extensions/apm-server/apm-server-compose.yml

@@ -7,7 +7,7 @@ services:
       args:
         ELK_VERSION: $ELK_VERSION
     volumes:
-      - ./extensions/apm-server/config/apm-server.yml:/usr/share/apm-server/config/apm-server.yml:ro
+      - ./extensions/apm-server/config/apm-server.yml:/usr/share/apm-server/apm-server.yml:ro
     ports:
       - "8200:8200"
     networks: