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Andrei Kvapil
0b70197bf1
## What this PR does Changes the default `resourcesPreset` for both `kafka` and `zookeeper` in the Kafka managed application from `small` (1 CPU / 512Mi) to `medium` (1 CPU / 1Gi). The `small` preset is no longer sufficient for the current Strimzi 0.45 / Kafka 3.9 image baseline: - Strimzi sets JVM heap to 50% of the container memory limit for Kafka and 75% for ZooKeeper. With a 512Mi limit that leaves only 256Mi (Kafka) or 128Mi (ZooKeeper) for the JVM non-heap. - Actual non-heap usage in the Kafka 3.9 image (Metaspace, code cache, direct buffers, JMX javaagent, embedded Jetty admin server for `/v1/ready` and KRaft migration endpoints, thread stacks) systematically exceeds those budgets at startup, triggering a cgroup OOM kill (exit 137) before the broker can connect to ZooKeeper. Result on a fresh deployment with the previous default: every Kafka broker and every ZooKeeper pod ends up in `CrashLoopBackOff`, with `lastState.terminated.reason: OOMKilled`. ZooKeeper occasionally hits `OOMKilled` once quorum traffic ramps up, breaking the quorum and causing Kafka brokers to fail with `ZooKeeperClientTimeoutException`. The `medium` preset (1Gi) is the smallest preset that gives both Kafka (heap 512Mi + ~500Mi non-heap budget) and ZooKeeper (heap 768Mi + 256Mi non-heap budget) enough headroom to start cleanly. Users who need more can still pick `large`, `xlarge`, or `2xlarge`, or override `resources` explicitly. The `small` preset is intentionally kept in the enum so existing deployments that pin `resourcesPreset: small` are not broken; only the default changes. ### Release note ```release-note fix(kafka): default `resourcesPreset` for both Kafka and ZooKeeper is now `medium` (1 CPU / 1Gi). The previous default (`small`, 512Mi) is no longer sufficient under the current Strimzi 0.45 / Kafka 3.9 image and caused OOMKilled CrashLoopBackOff on fresh deployments. Existing deployments that explicitly set `resourcesPreset` are unaffected. ``` <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Chores** * Updated default resource allocation preset from "small" to "medium" for Kafka and ZooKeeper components across CRD type definitions, Helm chart values, and JSON schema configurations. * **Documentation** * Updated parameter reference tables to reflect the new default resource preset values for both Kafka and ZooKeeper. <!-- end of auto-generated comment: release notes by coderabbit.ai -->