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The OpenTelemetry project offers a bright future of observability, offering a comprehensive and standardized solution for surfacing, collecting, and reporting telemetry signals from your systems. While the future (and present) may be bright, integrating OpenTelemetry into existing libraries, applications, and systems can be an enormous challenge. From home-grown logging frameworks, vendor-specific APIs, and missing data, it can seem overwhelming to get started.

In this talk, we'll cover the building blocks of OpenTelemetry and how various platforms have integrated them. We'll also look at the motivations and benefits of moving to OpenTelemetry in a brownfield setting. Additionally, we'll examine the various strategies for integrating OpenTelemetry into existing applications.

Finally, I'll share my experiences of introducing and deploying OpenTelemetry solutions into brownfield systems, from code to production.

NDC Conferences

OpenTelemetry provides a standardized approach to observability in legacy systems. The talk demonstrates migrating brownfield .NET applications from vendor-specific logging (log4net) and tracing solutions to OpenTelemetry standards. Key steps include bridging existing logging frameworks to Microsoft.Extensions.Logging, enabling distributed tracing across microservices, and configuring exporters for tools like Zipkin. The approach emphasizes incremental migration through small, verifiable steps rather than wholesale rewrites, allowing teams to modernize observability without vendor lock-in while maintaining backward compatibility with .NET Framework applications.

OpenTelemetry in a Brownfield World - Jimmy Bogard - NDC Copenhagen 2025