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InfluxDB
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As /u/usaoc said, ensure-list can be used for this purpose - I use it all the time in my packages. I recommend to take advantage of the Compat package from GNU ELPA, such that you can use all new Emacs APIs even in packages targeting older Emacs versions. I am the maintainer of Compat. See also https://www.reddit.com/r/emacs/comments/10iep0o/compat_29130/ for more background.
Exactly! This is also why I like Compat. I have to read through the Emacs NEWS anyway, then I can just as well add the functions directly to Compat. The small downside however is that Compat pretends that some function is available in your Emacs. If you write a package you must look twice where a function is coming from. This should not be a problem if you use package-lint, which you should! But see also https://github.com/purcell/package-lint/issues/227.