Observability on Allen Ziegenfushttps://allenz.net/tags/observability/Recent content in Observability on Allen ZiegenfusHugoen-usWed, 22 Apr 2026 00:00:00 +0000Structured JSON logging for a legacy Java app on Kubernetes — without forking the imagehttps://allenz.net/writing/structured-json-logging-for-a-legacy-java-app-on-kubernetes-without-forking-the-image/Wed, 22 Apr 2026 00:00:00 +0000https://allenz.net/writing/structured-json-logging-for-a-legacy-java-app-on-kubernetes-without-forking-the-image/How to retrofit machine-parseable JSON logging onto a legacy Java app on Kubernetes — both log4j2 and Tomcat’s JUL — without forking the vendor image, as an opt-in, fail-open, cleanly revertible layer.