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Docs: Renderer token (#59560)

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* Docs: renderer token

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Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

* Update docs/sources/setup-grafana/image-rendering/_index.md

* Update docs/sources/setup-grafana/configure-grafana/_index.md

* makes prettier

Co-authored-by: Joan López de la Franca Beltran <joanjan14@gmail.com>
Co-authored-by: Joan López de la Franca Beltran <5459617+joanlopez@users.noreply.github.com>
Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Chris Moyer <chris.moyer@grafana.com>
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docs/sources/setup-grafana/configure-grafana/_index.md
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@ -1835,6 +1835,12 @@ This option does not require any configuration.
Options to configure a remote HTTP image rendering service, e.g. using https://github.com/grafana/grafana-image-renderer.
#### renderer_token
> **Note**: Available in Grafana v9.1.2 and Image Renderer v3.6.1 or later.
An auth token will be sent to and verified by the renderer. The renderer will deny any request without an auth token matching the one configured on the renderer.
### server_url
URL to a remote HTTP image renderer service, e.g. http://localhost:8081/render, will enable Grafana to render panels and dashboards to PNG-images using HTTP requests to an external service.

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docs/sources/setup-grafana/image-rendering/_index.md
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@ -54,6 +54,34 @@ docker run -d --name=renderer --network=host -v /some/path/config.json:/usr/src/
You can see a docker-compose example using a custom configuration file [here](https://github.com/grafana/grafana-image-renderer/tree/master/devenv/docker/custom-config).
### Security
> **Note:** This feature is available in Image Renderer v3.6.1 and later.
You can restrict access to the rendering endpoint by specifying a secret token. The token should be configured in the Grafana configuration file and the renderer configuration file. This token is important when you run the plugin in remote rendering mode.
Renderer versions v3.6.1 or later require a Grafana version with this feature. These include:
- Grafana v9.1.2 or later
- Grafana v9.0.8 or later patch releases
- Grafana v8.5.11 or later patch releases
- Grafana v8.4.11 or later patch releases
- Grafana v8.3.11 or later patch releases
```bash
AUTH_TOKEN=-
```
```json
{
"security": {
"authToken": "-"
}
}
```
See the [Grafana configuration]({{< relref "../configure-grafana/#renderer_token" >}}) for how to configure the token in Grafana.
### Rendering mode
You can instruct how headless browser instances are created by configuring a rendering mode. Default is `default`, other supported values are `clustered` and `reusable`.