EP1: Inter-AZ data transfer charges buried in your EKS bill

Your EKS cluster is running fine. No errors, no alerts. But buried in the bill is a $2,000/month data transfer charge that has nothing to do with S3. It's inter-AZ traffic between nodes in the same cluster, billed under DataTransfer-Regional-Bytes, and it's almost impossible to catch without enabling VPC Flow Logs, which come with their own cost.

In this episode of Hiding in Production, DoiT Senior Cloud Architect Piyush Patil walks through how he diagnosed the root cause, what solving it manually looks like (11 steps, multiple teams, days of waiting), and the CloudFlow automation that replaced the entire process.