Correlation IDs in ASP.NET Core: A Practical Guide for Backend Engineers

Short summary

Correlation IDs are unique identifiers attached to requests flowing through distributed systems, enabling engineers to track logs across multiple services without searching by timestamp or endpoint. They differ from trace IDs (used by observability tools) and should be opaque, never containing sensitive data. Implement them by checking for existing headers, generating IDs when missing, and propagating them through all downstream services.

• •Correlation IDs enable request tracing across microservices for operational debugging
• •Distinguished from trace IDs; correlation IDs are human-readable request identifiers for log searches
• •Implementation: check for existing header, generate if missing, propagate downstream, return to client

Generated with AI, which can make mistakes.