Most observability systems are built to detect problems and surface them.Most automation is built to react and remediate. Both miss something important: the most valuable verdict an automated diagnostic system can produce is often "this is not my problem."
This talk argues that for any observability system claiming to attribute latency or root cause,the negative diagnosis -the confident statement that a subsystem is not the cause -is more valuable than the positive detection.It changes the social contract of incident response:from "everyone investigates everything" to "the system that owns the signal owns the diagnosis."
Drawing on work building component-level latency attribution inside an edge proxy,this talk presents the negative diagnosis as a design pattern: how to build it,why its threshold structure differs from positive detection,why it is harder to defend,and why systems that know when not to fire are the systems engineers actually trust enough to deploy autonomously.