.NET Core 3.0 2020/3/3でEOS

.NET Core 3.0 will reach end of life on March 3, 2020. It is a “Current” release and is superseded by .NET Core 3.1, which was released on December 3, 2019. After that time, .NET Core patch updates will no longer include updated packages .NET Core 3.0.

情報源: .NET Core 3.0 will reach End of Life on March 3, 2020 | .NET Blog

.NET Coreを使っていて知らない人はいないと思いますが、.NET Core 3.0はまもなくEnd Of Support(EOS)となります。速やかに.NET Core 3.1へ移行させましょう。.NET Core 3.1はLTSなので2022/12/3までサポートされます。