wtf is upgrade?

This project provides tools to help teams upgrade and migrate their OpenEBS storage systems. OpenEBS is software that manages storage for applications running in Kubernetes clusters. When a new version of OpenEBS comes out, you can't just flip a switch, the stored data, storage pools, and management components all need to be carefully updated together. This repo provides the components and instructions to make that process work smoothly. The project handles two main jobs. First, it helps upgrade existing OpenEBS storage resources, like CSPC pools, cStor volumes, and Jiva volumes, to newer versions. Second, it helps migrate older storage configurations to newer formats, such as moving from the older SPC style of managing cStor pools to the newer CSPC format, or converting externally provisioned volumes to the CSI standard. The README notes an important caveat: after upgrading the management software, you need to upgrade the underlying pools and volumes promptly, otherwise operations like expanding volumes or scaling pools won't work until everything matches. The people who would use this are infrastructure engineers or DevOps teams already running OpenEBS in production. For example, if your team set up OpenEBS a year ago and now wants to move to the latest version to get new features and bug fixes, this project walks you through updating each piece in the right order. It's also useful if you're moving from an older way of organizing storage to a newer one that's better supported going forward. The README is fairly sparse on implementation details, it's essentially a set of links to step-by-step documentation rather than a deep technical overview. It does flag some specific gotchas, like requiring Kubernetes 1.17.0 or higher for migrations, and special steps needed if you're using Rancher or virtual disks. The project is written in Go and is part of the broader OpenEBS ecosystem, an open-source storage platform.