docs: message validation for kafka

pages/docs/tutorials/message-validation-for-kafka.md

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+---
+title: Message validation for Kafka
+description: The goal of this tutorial is to help you validate messages for Kafka.
+weight: 150
+---
+
+## Introduction
+
+This tutorial will teach you how to validate messages within a Kafka-based system using AsyncAPI specifications.
+
+Validating messages for Kafka involves defining message schemas using AsyncAPI and then using those schemas to validate incoming and outgoing messages in your Kafka-based applications. 
+
+At the end of the tutorial, you should understand the importance of message validation, specify message schemas using AsyncAPI, and apply validation to ensure that the messages exchanged between different components in a Kafka-based system are consistent and adhere to predefined rules.
+
+
+```mermaid
+graph TB
+    A[Producer Service] -->|Publish Message| B[AsyncAPI Validation]
+    B -->|Valid Message| C[Kafka Broker]
+    C -->|Consume Message| D[AsyncAPI Validation]
+    D -->|Valid Message| E[Consumer Service]
+
+    subgraph "Message Validation with AsyncAPI"
+        B[Validate Message<br>against AsyncAPI Schema]
+        D[Validate Message<br>against AsyncAPI Schema]
+    end
+
+    subgraph "Kafka Messaging System"
+        C[Kafka Broker<br><br>Topic: userSignUp]
+    end
+
+    style A fill:#f9d,stroke:#333,stroke-width:2px
+    style E fill:#f9d,stroke:#333,stroke-width:2px
+    style B fill:#9cf,stroke:#333,stroke-width:2px
+    style D fill:#9cf,stroke:#333,stroke-width:2px
+    style C fill:#ccf,stroke:#333,stroke-width:2px
+
+    A -->|Publish Invalid Message| B
+    B -->|Invalid Message| F[Error Handling]
+    D -->|Invalid Message| G[Error Handling]
+```
+
+## Background context
+
+Message validation involves checking that the messages exchanged between systems adhere to a predefined structure or schema. It helps ensure the data being sent or received is accurate, complete, and in the expected format.
+
+Kafka transports messages between producers and consumers, while AsyncAPI provides a contract (schema) to which those messages must adhere. Validation tools can use the AsyncAPI specifications to check whether the messages meet the criteria before they are sent or processed.
+
+[Kafka](https://kafka.apache.org/documentation/#intro_nutshell) is a distributed event streaming platform for building real-time data pipelines and apps. It's horizontally scalable, fault-tolerant, and swift.
+
+[AsyncAPI](https://www.asyncapi.com/docs) is an open-source initiative that provides a specification for defining and documenting synchronous and asynchronous APIs. It acts as a contract that ensures all system components agree on the structure of messages for effective communication.
+
+
+To follow this tutorial, you need:
+
+* A knowledge of Kafka and AsyncAPI.
+* An understanding of Event-driven Architectures (EDAs).
+
+There are several ways to implement message validation for 
+## Installation guide
+
+
+
+
+## Broker-level message validation
+
+<!--- 
+Integrating message validation with Kafka producers
+Validating outgoing messages before sending them to Kafka
+--->
+At the broker level, message validation is about ensuring that the messages sent to Kafka topics comply with a specific predefined schema. In Kafka, you can use a Schema Registry to manage and validate schemas. Also, ensure that only valid messages are written to the Kafka topics.
+
+Define an AsyncAPI schema
+Configure Kafka
+
+
+## Client-level message validation
+
+<!--- 
+Integrating message validation with Kafka consumers
+Validating incoming messages before processing
+--->
+
+Generate Code
+Implement Validation
+
+## Summary
+
+Combining Kafka's robust message streaming capabilities with AsyncAPI's standardized documentation and tooling, developers can ensure that the messages exchanged in a distributed system are validated effectively, ensuring data integrity and system reliability.
+
+
+
+## Next steps
+
+Now that you have completed this tutorial automate the validation and generation process in your continuous integration pipelines.
+
+## Additional resources
+
+<!---
+Add Joy's tutorial on how to Create an AsyncAPI document for Kafka Messages using AsyncAPI.
+
+Add Arya's Guide on message validation
+--->