Microsoft Flow beginners guides: how to detect that a page is a SharePoint news page

Modern SharePoint pages support built-in approval flows. While it's a cool feature, probably you don't need approval for all pages, but for news posts only. The question is how to detect that a page is a news post page? 

It turned out that it's not difficult at all! Every modern site page has a field called Promoted State. It holds information if a page was promoted as news or not. For regular site pages, the value of this field will be empty, for news post pages it will be equal to 1 (if a page is not yet published) or 2. The trick is to check the state of this field and make a final decision. More...