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Our service got forty percent more expensive and nothing could say where

After a routine platform bump in July, the order service needed about forty percent more CPU for the same work. Requests per second unchanged, p95 up by sixty milliseconds, node count up by four.

  • Service costs increased by forty percent after July upgrade
  • CPU usage rose by forty percent, p95 latency increased by sixty milliseconds
  • Root cause traced to thirty-four dependencies changing simultaneously

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