Why df -h misses three of the four causes of a full disk: inode exhaustion, deleted-but-open files, and the super-user reserve, and how to tell them apart on Linux and Kubernetes.

Why df -h misses three of the four causes of a full disk: inode exhaustion, deleted-but-open files, and the super-user reserve, and how to tell them apart on Linux and Kubernetes.
Linux provides robust tools for managing files and directories, making it an essential operating system for developers, administrators, and power users. One of the most common tasks is checking the size of directories, especially when monitoring disk usage or troubleshooting