CF 21 The Runtime service is not available error on macOS Monterey

Yazy, your screenshots of the startup log lines show clearly that CF is starting and then ending about 30 seconds later.  Are you saying that during that time, you visited the CF Admin and got the error you show?  I ask because I would have expected to see error lines in either of those, when you got the error you offered initially here.

As for the startup lines, they show no problem at all. (They also show that you seem to have this instance of CF being monitored by the CF PMT monitor, but I don't see that being a cause of the error above.)

Since the error is not about startup (it seems), we need to look elsewhere.

First, help us out: was this CF instance working for some hours, days, weeks, or months, then suddenly not working? What changed? Did you apply CF updates, perhaps? Anything else you can think of? Did you or anyone tweak any underlying CF config files, perhaps trying to solve some other problem?

If you had recently applied a CF update, look to the CF update installation log, which is NOT in the same cf logs folder, but in another location entirely. I have a blog post on where to find that, and how to quickly confirm if the update worked with 0 errors or not. 

Finally, I hear you saying you are tempted to just reinstall CF. I understand how some folks get to that point of frustration or desparation (or simply lack of interest in finding a solution). I'll note that I have nearly always been able to help folks find and fix whatever was amiss. I do it with people daily. If you might be open to as little as 30 or even 15 minutes working together remotely, it may not take much longer for us to save you that effort of a reinstall.  You can learn more about my rates, approach, satisfaction guarantee, and more at carehart.org/consulting. I offer my online booking calendar there, and though it doesn't offer weekend hours, we can arrange that via email (address offered there also).

That said, I'm happy to keep helping here only. It's just that I can't always respond readily, and with the holidays it may be even more challenging, but I'll try to watch out for your reply.