This question already has an answer here:
I work at a small business (about 30 full timers), and my department is currently running on a skeleton crew of just 7 bodies. We honestly can not manage with fewer than these numbers.
There are a few of my coworkers who are currently in talks with other companies and I fear that if they both put in their 2 week notice at once management will be scrambling to replace them and the training won't be done anywhere near where we needs it to be.
Should I let management know that a few people might be on their way to other ventures and to start looking through the resumes now for potential new hires?
I don't say this out of company loyalty, but rather self preservation. The last time our department got super understaffed like this and our output dropped the higher ups thought it was a problem with the current personnel and let most of the workers go and brought in a whole new crew (myself included).