Google recently published information about search live coverage carousel pilot which lets publisher notify Google when your breaking content is available. Breaking content includes live blog, full length articles, videos etc.
“Google can then surface content more quickly than is currently possible with a standard crawl on your website. With the Search live coverage carousel, users can find content about live sports, elections, and breaking news as soon it’s available on your site. Breaking content can include live blogs, full length articles, videos and more. ”
In order to participate in the live coverage pilot, below mentioned criteria should be met:
Content must be published using Accelerated Mobile Pages (AMP)
By publishing your content with AMP, you’ll enable your pages to be loaded nearly instantly to users' devices. Read about how to Use AMP HTML in the AMP public developer docs.
Your AMP pages must include structured data markup for the content itself
Structured data markup enables the preview for your live coverage article on the Search page and also helps Google better understand the context around a piece of content. Find out more in the Introduction to Structured Data.
Content must be pushed to Google using an Atom XML feed
When you send your content to Google, you should use an an HTTP POST request in an Atom XML feed that contains your AMP page content as soon as it is published on the web. This allows Google to more quickly index your content.