Tag
observability
- Jun 11, 2026 Coordinated Omission in Latency Measurement Why measuring response time only for completed requests hides the worst delays, how the bias arises, and which measurement schemes avoid it without inventing numbers. backend systems
- Jan 20, 2025 Mapping Runtime Dependencies from Traffic and Query Logs Why static call graphs miss the dependencies that decide whether a legacy component can be removed, and how to reconstruct the real graph from query logs, flow records, and scheduler output. software architecture
- Jan 7, 2025 Separating Injected Faults from Organic Failures in Telemetry How to mark injected traffic so it survives every hop, why filtering at query time beats deleting at ingestion, and how to keep an exercise out of the alert path without blinding it. devops
- Sep 2, 2024 Where Latency Is Measured, and Why Percentiles Do Not Average A serving latency number is a function of the point where the clock starts, and percentiles computed at different layers cannot be combined; both facts determine whether a monitoring figure means anything. inference systems
- Mar 12, 2024 How strace Sees Every System Call Without Linking Into the Program The ptrace stop protocol behind syscall tracing, how entry and exit are paired from register state, and why tracing multiplies the cost of a syscall-heavy workload. systems programming
- Aug 15, 2022 Diagnosing a Wakeup That Never Arrived A method for distinguishing a scheduler that declined from a request that was never made, using the platform logs and the app own durable records as two independent witnesses. mobile computing
- May 21, 2022 What Behavior-Preserving Change Cannot Preserve Cost, stack shape, interleaving, and resource lifetime fall outside the observation set by design. The cases where that exclusion stops being acceptable are the ones that matter. software engineering
- Apr 18, 2022 Service Level Objectives for a Platform, Not for a Service A platform SLO measures whether tenants can get work done, not whether a component is up. How to define the request journey, choose indicators that tenants feel, and handle the shared-dependency problem. virtualization