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Backpressure Collapse in Reactive Stream Fan-Out Topologies : Observability Blind Spots During Incidents
KotlinApache PulsargRPCMicrometer
Problem Breakdown
The systemic weakness is that observability is built for the happy path: metrics, traces, and logs are wired up under normal conditions, then discovered to be insufficient exactly when an incident starts. A fast publisher fans out into N slow subscribers through unbounded or naively-bounded queues; the slowest subscrib…
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