https://kotlin.website/blog Notes on Kotlin, Kotlin/Native and the libraries I maintain. en https://kotlin.website/blog/native-under-load https://kotlin.website/blog/native-under-load 28 ms to first response and 20 MiB idle. Then the load arrived — and three of my own measurements turned out to be wrong. Wed, 12 Aug 2026 00:00:00 GMT https://kotlin.website/blog/bugs-that-dont-fail https://kotlin.website/blog/bugs-that-dont-fail 294 tests, 71 specification scenarios, and four bugs that only a real mongod would show — because none of them threw anything. Fri, 7 Aug 2026 00:00:00 GMT https://kotlin.website/blog/logs-for-an-agent-to-read https://kotlin.website/blog/logs-for-an-agent-to-read Handing a coding agent a dashboard link is handing it nothing. tracy makes MCP the primary read path — and that single decision changes what the storage has to store. Sun, 19 Jul 2026 00:00:00 GMT https://kotlin.website/blog/a-broker-that-fits-in-one-head https://kotlin.website/blog/a-broker-that-fits-in-one-head booblik reproduces what makes an append-only log fast and leaves out everything that makes Kafka a cluster — including three features that are incompatible with zero-copy by construction. Sun, 21 Jun 2026 00:00:00 GMT https://kotlin.website/blog/percentiles-dont-average https://kotlin.website/blog/percentiles-dont-average metrik costs the monitored service 106 nanoseconds per request and a UDP packet a minute — and the reason it merges percentiles instead of averaging them is that averaging them is simply wrong. Sun, 24 May 2026 00:00:00 GMT https://kotlin.website/blog/what-is-left-if-you-die-halfway https://kotlin.website/blog/what-is-left-if-you-die-halfway A saga engine built around one question. Steps as interceptors, compensation in reverse, and an outbox that makes "the work happened but the notification never went out" structurally impossible. Sun, 12 Apr 2026 00:00:00 GMT https://kotlin.website/blog/smtp-from-the-spec https://kotlin.website/blog/smtp-from-the-spec A Kotlin/Native service has two ways to send mail — shell out to sendmail, or wrap libcurl. Both hide the protocol exactly where it has to be visible. Sun, 1 Mar 2026 00:00:00 GMT https://kotlin.website/blog/the-screenshot-is-the-test https://kotlin.website/blog/the-screenshot-is-the-test mani is a Kotlin Multiplatform demo where the same server compiles to the JVM and to a native binary — and where the picture advertising the interface cannot drift from it. Sun, 8 Feb 2026 00:00:00 GMT https://kotlin.website/blog/bots-as-state-machines https://kotlin.website/blog/bots-as-state-machines telek models a conversation as pure transitions with effects on the side — which is what makes a wizard resumable, testable and portable between two transports. Sun, 25 Jan 2026 00:00:00 GMT https://kotlin.website/blog/crash-tracker-kotlin-native https://kotlin.website/blog/crash-tracker-kotlin-native katcher — Kotlin/Native, Ktor and HTMX, in one binary small enough that nobody has to justify running it. Sat, 6 Dec 2025 00:00:00 GMT https://kotlin.website/blog/screenshots-without-an-emulator https://kotlin.website/blog/screenshots-without-an-emulator viddik renders Compose Multiplatform through a real Compose Desktop window instead of LayoutLib, so goldens stay the same on macOS, Linux and Windows. Sun, 19 Oct 2025 00:00:00 GMT https://kotlin.website/blog/ask-the-desktop https://kotlin.website/blog/ask-the-desktop A custom title bar for Compose Desktop has to know which side the buttons go on. On Linux there is no answer — so appframe asks GNOME directly. Sun, 14 Sep 2025 00:00:00 GMT