Monedula
Writing & open source
№ 00 / The shelf

We write things down and we build small open source pieces. This is where both live. Have a look — and tell us what you think.

№ 01
Writing
24 Jun 2026

Kafka is easier to understand when you can break it

Kafka's most important lessons live in the transitions: before and after a broker dies, before and after the ISR shrinks. We built a browser-based simulator so you can break a cluster safely and watch exactly why it reacts the way it does.

All writing →
№ 02
Projects
Go · active

monedula-acl-rbac-converter

A safe, auditable command-line tool for converting Apache Kafka ACLs into Confluent RBAC role bindings. Plans are checksummed and effective access is verified before anything is applied.

Java · active

monedula-metrics-reporter

A Kafka MetricsReporter plugin that ships broker and client metrics over OTLP to an OpenTelemetry collector. Async and fail-safe — collector outages never block Kafka.

All projects →