This article delves into the hidden iOS OOM crashes, explains the Jetsam watchdog mechanism, the role of phys_footprint, compares industry solutions, and provides step‑by‑step implementations for monitoring, allocation tracking, and proactive memory‑management strategies to prevent silent terminations.
This article explores Hades, the in‑house mobile monitoring platform at Huolala, detailing the challenges of capturing iOS Abort exceptions, evaluating four industry solutions, and describing the final MetricKit‑based implementation, data processing pipeline, observed benefits, and future monitoring strategy.
This article explains what SIGKILL crashes are on iOS, how the operating system terminates a process, how to capture SIGKILL events using the MetricKit framework with code examples, the meaning of common termination codes, and practical fixes for typical SIGKILL scenarios in mobile apps.
A SIGKILL crash indicates the OS forcibly terminated an iOS app, which cannot be caught directly, but MetricKit (iOS 14+) can automatically collect diagnostic payloads after restart, allowing developers to extract termination reasons, stack traces, understand codes like 0x8badf00d, and address common causes such as main‑thread watchdog timeouts and deadlocks.
MetricKit, introduced in iOS 13 and expanded in iOS 14, provides a low‑overhead, system‑driven way to collect app performance, power, and crash diagnostics over the last 24 hours, enabling developers to upload, analyze, and optimize their iOS applications without third‑party SDKs.
This guide explains how to improve iOS app performance by monitoring eight key metrics—battery, launch time, hang rate, memory, disk writes, scrolling, termination, and MXSignposts—using Xcode Organizer, MetricKit, Instruments, XCTest, and the App Store Connect API.
