Have separately configured grafana image renderer, installed plugin and now can render any graphs.
But telegram alerts still without images and no any checkbox "Include image"
Grafana v8.4.6 Grafana Image Renderer v3.4.2
What should be configured else?
Yes, since v9.0 is there a new way to take screenshots of panels.
1 - Create an alert from the panel, as always
2 - Setup alert
3 - Keep Dashboard UID and Panel ID annotations.
In v9.1 will be compatible with Telegram
More info in this discussion: https://github.com/grafana/grafana/discussions/38030
Official doc page: (with compatible notificators) https://grafana.com/docs/grafana/latest/alerting/images-in-notifications/