Failed to render and upload alert panel image

Grafana Alerting
1

@daniellee @torkel @mefraimsson Failed to render and upload alert panel image.
Docker Grafana v6.4.4
Slack Alerting :
Getting only text in slack alert, no image
Error:
lvl=eror msg=“Failed to render and upload alert panel image.” logger=alerting.notifier ruleId=31 error=“Timeout error. You can set a timeout in seconds with &timeout URL parameter”
renderer: PhantomJS

Tried: Grafana-plugin as a separate container
Getting only text in alert, no image
And the strange thing here is no error
Log Output shows “Render Request Received” and the same thing gets repeated for every alert, but no image, no error msg, Include Image is enabled in setting

Tried: v6.6.0 docker image
same error

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