Apache Kafka has become a foundational platform for high throughput event streaming, enabling real time analytics, financial transaction processing, industrial telemetry, and large scale data driven systems. Despite its maturity and widespread adoption, consolidated research on reusable architectural design patterns and reproducible benchmarking methodologies remains fragmented across academic and industrial publications. This paper presents a structured synthesis of forty two peer reviewed studies published between 2015 and 2025, identifying nine recurring Kafka design patterns including log compaction, CQRS bus, exactly once pipelines, change data capture, stream table joins, saga orchestration, tiered storage, multi tenant topics, and event sourcing replay. The analysis examines co usage trends, domain specific deployments, and empirical benchmarking practices using standard suites such as TPCx Kafka and the Yahoo Streaming Benchmark, as well as custom workloads. The study highlights significant inconsistencies in configuration disclosure, evaluation rigor, and reproducibility that limit cross study comparison and practical replication. By providing a unified taxonomy, pattern benchmark matrix, and actionable decision heuristics, this work offers practical guidance for architects and researchers designing reproducible, high performance, and fault tolerant Kafka based event streaming systems.