Here is my understanding: there may be 1.15.x releases with important bug or security fixes even after 1.16.1 is published. There is no explicit policy. Once the Gitea maintainers feel 1.15.x can reliably migrate to 1.16.x and that 1.16.x is not exhibiting bugs that are expected in a newly released major version, they are unlikely to feel motivated to publish another 1.15.x point release. If someone is concerned about a bug or about security, it will be recommended that they upgrade to 1.16.x.
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