Updated introduction and added a note. (#32236)

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      docs/sources/administration/image_rendering.md

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# Image rendering
Grafana supports automatic rendering of panels and dashboards as PNG images. This allows Grafana to automatically generate images of your panels to include in [alert notifications]({{< relref "../alerting/notifications.md" >}}).
Grafana supports automatic rendering of panels as PNG images. This allows Grafana to automatically generate images of your panels to include in [alert notifications]({{< relref "../alerting/notifications.md" >}}).
>**Note:** Image rendering of dashboards is not supported at this time.
While an image is being rendered, the PNG image is temporarily written to the file system. When the image is rendered, the PNG image is temporarily written to the `png` folder in the Grafana `data` folder.

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