I've got an e-mail about CircleCI docker image deprecations. But I don't recognize any of the mentioned images in my projects:

We want to let you know that on October 26th, 2020 we will begin descaling some of the machine images you’re currently using (listed below) .

The deprecations will include:
Linux machine images:
circleci/classic:201703-01
circleci/classic:201708-01
circleci/classic:201709-01
circleci/classic:201710-01
circleci/classic:201710-02
circleci/classic:201711-01
circleci/classic:201808-01
circleci/classic:edge
circleci/classic:latest
circleci/classic

I'm using circleci/clojure:lein-2.8.1 in most of my projects (by virtue of copy pasting from one project to another)