You built a dozen APIs. They work fine until one morning a customer file vanishes into the void and no one knows which service touched it. That’s when observability stops being optional. The trick is to see every call without drowning in telemetry. Azure API Management paired with Lightstep makes that happen.
Azure API Management (APIM) controls how traffic flows between clients and backend services. It enforces identity, quotas, and policy. Lightstep, built for distributed tracing and performance insight, stitches together events across microservices and infrastructure. When you connect them, every API interaction turns into a traceable, measurable event you can trust.
The integration starts where the gateways live. APIM exposes a monitoring pipeline where request and response data can be enriched with trace context. Lightstep receives that context through OpenTelemetry and correlates it across spans and services. The result is a full end-to-end request timeline covering both Azure-managed and custom components. Engineers see the truth of latency, not just the symptoms.
To configure it, you inject trace headers inside APIM policies before routing traffic. Those headers carry Lightstep’s trace identifiers downstream. Your backend services, already instrumented with Lightstep SDKs or OpenTelemetry exporters, attach their own spans. When APIM forwards responses, it closes the loop with final metrics and logs. The workflow preserves security boundaries and never exposes secrets, since the trace data is metadata, not payload.
Keep a few best practices in mind. Map your Azure identities to production services through managed identities or OIDC tokens. Rotate any Lightstep access keys using Azure Key Vault. Validate every trace ID at the edge to stop spoofed calls. And before going live, confirm that your APIM policies don’t strip needed headers during transformations.