Ben Laurie's original paper on Certificate Transparency proposed that clients (browsers) should "gossip". In particular, it proposed that when a browser connects to a web server, it should send to the server the latest signed tree head from a Certificate Transparency log. This enables comparing what different browsers are seeing, and enables detecting some attacks where the CT log server equivocates and serves different logs to different entities. However, the paper also mentions that this idea is tentative and still being explored.
Was anything like this ever implemented and adopted? What was the ultimate decision on gossip?