If you're curious about k8s' formation from earlier projects like Borg and Omega, this is a great listen. This podcast talks about the history of k8s and the CNCF. One interesting thought from the podcast is the updated answer to the question, "What is cloud native?" Here's an excerpt from the definition:
[Cloud Native technologies] enable loosely coupled systems that are resilient, manageable, and observable. Combined with robust automation, they allow engineers to make high-impact changes frequently and predictably with minimal toil.