Improve documentation for Load Balancing with Eureka and Spring Cloud LoadBalancer

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.

Engineering Problem

Understanding the Problem

The documentation around using Spring Cloud LoadBalancer with Eureka did not provide enough practical guidance about the request routing flow, configuration options, zone-based routing, metadata usage, or common troubleshooting scenarios.

Solution

Implementation Approach

Expanded the documentation with a detailed explanation of the load-balancing flow, YAML and Java configuration examples, guidance for zone-based routing and instance metadata, zone resolution strategies including hostname-based approximation, and troubleshooting guidance and best practices.

Technologies

Engineering Stack