Apart from scheduling a particular chart to be delivered in Slack, users can schedule a dashboard report with image or short summary of metrics. In order to do that, open dashboard and press on the Schedule button. 

In a pop-up window, name the report, choose the Slack channel, time, and frequency of report delivery. Lastly, hit the Save button. 

A Slack report that is set as an Image Preview  will look like the following (press on image if you'd like to zoom in).

A Slack report that is set as a Summary Table will look like the following.

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