Improve documentation for Spring Cloud LoadBalancer with Eureka integration

Contribution Overview

The Engineering Context

This contribution was made to the spring-cloud/spring-cloud-netflixopen-source repository. The work involved understanding the existing codebase, identifying the underlying engineering problem, implementing a focused solution, and validating the change against the project's existing behaviour and testing standards.

Original Issue

Improve documentation for Spring Cloud LoadBalancer integration with Eureka.

Developers needed clearer guidance on how service discovery through Eureka integrates with Spring Cloud LoadBalancer, including practical usage and zone preference behaviour.

Engineering Problem

Understanding the Problem

The existing documentation did not provide enough practical explanation of the request flow between Eureka service discovery and Spring Cloud LoadBalancer, making it harder for developers to understand service resolution, instance selection, zone preference, and common configuration issues.

Solution

Implementation Approach

Expanded the documentation with an explanation of the load-balancing flow, a RestTemplate example, zone preference guidance, troubleshooting notes, and production-oriented best practices for using Spring Cloud LoadBalancer with Eureka.

Technologies

Engineering Stack