An AWS cost anomaly exposed years of hidden infrastructure drift across EKS and RDS. What looked like a simple version upgrade turned into a six-hour production maintenance exercise.
Nothing was down.
No alerts were firing. No customers were complaining.
CPU looked normal. Memory looked normal. The applications were serving traffic.
AWS just started charging more.
The first cost anomaly pointed to EKS extended support. A few days later, another one appeared for RDS MySQL extended support.
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