Missing Container Disk I/O Stats with cgroup v1 on Kernel 6.1

As Amazon Linux 2 (AL2) approaches its End of Life on June 30, 2025, we have started migrating our container platform from AL2 to Bottlerocket. The migration encountered a few speed bumps. In this post, we'll examine one of them: missing container disk I/O stats. Why are container I/O dashboards blank? Since Bottlerocket shares the same kernel used by Amazon Linux 2023 (AL2023), I will use AL2023…