cloudprober VS Sloth

Do you mean that your service doesn't have enough traffic all the time? Then you can (and should) use synthetic clients to send requests to your endpoint. They provide both a minimal amount of traffic all day round and also can report on responses they get and improve your coverage. Example project: https://github.com/google/cloudprober

If your service might at times fall to almost zero requests outside business hours, having a synthetic client is a must. You can use Blackbox exporter as mentioned by u/SuperQue or CloudProber, both work well for simple cases (one step site check or API call), for anything more complicated (multi step scenarios) you are better off scripting it.

Relatively easy to achieve: through variety of available opensource projects like cloudprober or blackbox exporter (if your test case is straight forward) or custom made programs out of bash, python, golang (if your test case is more complex).

That said, after I learned about how to use lsof, I found this little free app called =Sloth (and its github page ), which is just a nice native Mac app serving as a GUI for lsof. It'll let you know exactly which process to quit or kill so your drive can eject happily.

Random fact; this website is created and maintained by Sveinbjörn Þórðarson who also made Platypus (https://github.com/sveinbjornt/Platypus) and Sloth (https://github.com/sveinbjornt/Sloth) — software that Mac nerds might be familiar with.

Sveinbjörn is a ball of energy that just radiates positives for human society.

git clone https://github.com/sveinbjornt/Sloth.git

a very nice, open source, app that provides similar functionality but also shows open files is Sloth (https://sveinbjorn.org/sloth).

Sloth will do what you need.