docs: update installation guide

README.md

@@ -29,17 +29,38 @@ The extension requires the following application key scopes:
 
 ## Installation
 
-We recommend that you install the extension with
-our [official Helm chart](https://github.com/steadybit/extension-datadog/tree/main/charts/steadybit-extension-datadog).
+### Kubernetes
 
-### Helm
+Detailed information about agent and extension installation in kubernetes can also be found in
+our [documentation](https://docs.steadybit.com/install-and-configure/install-agent/install-on-kubernetes).
 
-```bash
-helm repo add steadybit-extension-datadog https://steadybit.github.io/extension-datadog
-helm repo update
+#### Recommended (via agent helm chart)
+
+All extensions provide a helm chart that is also integrated in the
+[helm-chart](https://github.com/steadybit/helm-charts/tree/main/charts/steadybit-agent) of the agent.
+
+You must provide additional values to activate this extension.
+
+```
+--set extension-datadog.enabled=true \
+--set extension-datadog.datadog.apiKey="{{API_KEY}}" \
+--set extension-datadog.datadog.applicationKey="{{APPLICATION_KEY}}" \
+--set extension-datadog.datadog.siteParameter="{{SITE_PARAMETER}}" \
+--set extension-datadog.datadog.siteUrl="{{SITE_URL}}" \
 ```
 
+Additional configuration options can be found in
+the [helm-chart](https://github.com/steadybit/extension-datadog/blob/main/charts/steadybit-extension-datadog/values.yaml) of the
+extension.
+
+#### Alternative (via own helm chart)
+
+If you need more control, you can install the extension via its
+dedicated [helm-chart](https://github.com/steadybit/extension-datadog/blob/main/charts/steadybit-extension-datadog).
+
 ```bash
+helm repo add steadybit-extension-datadog https://steadybit.github.io/extension-datadog
+helm repo update
 helm upgrade steadybit-extension-datadog \
   --install \
   --wait \
@@ -53,32 +74,20 @@ helm upgrade steadybit-extension-datadog \
   steadybit-extension-datadog/steadybit-extension-datadog
 ```
 
-### Docker
-
-You may alternatively start the Docker container manually.
-
-```bash
-docker run \
-  --env STEADYBIT_LOG_LEVEL=info \
-  --env STEADYBIT_EXTENSION_API_KEY="{{API_KEY}}" \
-  --env STEADYBIT_EXTENSION_APPLICATION_KEY="{{APPLICATION_KEY}}" \
-  --env STEADYBIT_EXTENSION_SITE_PARAMETER="{{SITE_PARAMETER}}" \
-  --env STEADYBIT_EXTENSION_SITE_URL="{{SITE_URL}}" \
-  --expose 8090 \
-  ghcr.io/steadybit/extension-datadog:latest
-```
-
-## Register the extension
+### Linux Package
 
-Make sure to register the extension at the steadybit platform. Please refer to
-the [documentation](https://docs.steadybit.com/integrate-with-steadybit/extensions/extension-installation) for more information.
+Please use
+our [agent-linux.sh script](https://docs.steadybit.com/install-and-configure/install-agent/install-on-linux-hosts)
+to install the extension on your Linux machine. The script will download the latest version of the extension and install
+it using the package manager.
 
-### Linux Package
+After installing, configure the extension by editing `/etc/steadybit/extension-datadog` and then restart the service.
 
-Please use our [agent-linux.sh script](https://docs.steadybit.com/install-and-configure/install-agent/install-on-linux-hosts) to install the extension on your Linux machine.
-The script will download the latest version of the extension and install it using the package manager.
+## Extension registration
 
-After installing configure the extension by editing `/etc/steadybit/extension-datadog` and then restart the service.
+Make sure that the extension is registered with the agent. In most cases this is done automatically. Please refer to
+the [documentation](https://docs.steadybit.com/install-and-configure/install-agent/extension-discovery) for more
+information about extension registration and how to verify.
 
 
 ## Proxy