private String jsonStringify(Object obj) {
        try {
            return JSON.writeValueAsString(obj);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
Partitions that are ready to be consumed.
Only used during the initial topic readiness check, which is, {@link #preparing} is true.
tools/src/main/java/org/apache/kafka/tools/automq/PerfCommand.java