Apple has sent a message to macOS developers asking them to submit their applications to be notarized.
macOS Mojave is here. Give Mac users even more confidence in your software distributed outside the Mac App Store by submitting it to Apple to be notarized. When users on macOS Mojave first open a notarized app, installer package, or disk image, they’ll see a more streamlined Gatekeeper dialog and have confidence that it is not known malware.
Developers can submit their software using Xcode 10. Apple also notes that an upcoming release of macOS will required Developer ID-signed software to be notarized.
More details at the link below.