We write about Apache Kafka and build free tools for it.

Monedula Flock

GitOps, ACL to RBAC migration and OpenTelemetry metrics for your clusters, the Kafka Simulator in your browser, and a CLI that opens your cluster in it.

• Kafka Simulator

  An interactive, deterministic Apache Kafka simulator in the browser: break a cluster, scrub the timeline and read why it reacted.

• monedula-gitops

  GitOps for Apache Kafka: topics, access, quotas, schemas, SCRAM users and Confluent RBAC, from a CLI or a Kubernetes operator.

• monedula-acl-rbac-converter

  A CLI that converts Apache Kafka ACLs into Confluent RBAC role bindings through a checksummed plan and verifies effective access before any ACL is deleted.

• monedula-metrics-reporter

  A Kafka MetricsReporter plugin that ships broker, JVM and KIP-714 client metrics over OTLP; a collector outage never blocks Kafka.

• monedula-sim-link

  A read-only Go CLI that turns a real Kafka cluster into a shareable Kafka Simulator link, with an MCP server for AI agents.