Certificate Transparency is a recent requirement that all CAs log certificates into a public ledger when they are issued. If certificates are not logged into the 'CT logs' then modern browsers will refuse to accept them.
In the event a browser refuses to accept a certificate because it does not meet the 'CT Qualification' criteria, a user will be prevented from accessing your website. Expect-CT reports allow the browser to send a report when this happens.
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Network Error Logging
Certificate Transparency is already a requirement in most mainstream browser so sites already have to meet the CT Qualification criteria. Expect-CT reports allow you to know if your visitors are experiencing issues when visiting your site, issues that you previously wouldn't have known about.
Easy to enable
Provides valuable information
Discover configuration issues with your site
Learn about errors your users are seeing
Enabling Expect-CT is a simple case of issues the appropriate HTTP response header and in monitor mode there is no risk or adverse experience possible.
Once enabled you will only receive reports when your visitors experience an error on your site, an event you really want to know about.
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Best Emerging Technology 2018
"This is a completely new source of information that sites can use to better protect themselves and their visitors"
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