Mine was “deleting” a LARGE log file at 3am when I was oncall to clear up some disk apace and not getting that space back.
At the time I has no idea why and went into panic mode because the disk was 98% full and growing. Damn software kept the file open and was spamming the same line at least millions of times. After that I spent the tine to learn about common issue, inodes were one of them.