It is three in the morning, the on-call rotation is awake, and the logs scroll past at a rate the eye cannot track. Ten thousand identical lines reading "ERROR Request failed: Connection timeout" appear in the last fifteen minutes. The timestamps are dense, the request paths blurred, the causal chain absent. Somewhere in the system, a downstream call to an inventory service is failing. The log file does not, in any column, tell anyone which downstream call, which upstream caller, which user r...

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