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istio.io/content/help/faq/distributed-tracing/how-to-support-tracing.md

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What is required for distributed tracing with Istio? 10

Istio enables reporting of trace spans for workload-to-workload communications within a mesh. However, in order for various trace spans to be stitched together for a complete view of the traffic flow, applications must propagate the trace context between incoming and outgoing requests.

In particular, Istio relies on applications to propagate the B3 trace headers, as well as the Envoy-generated request ID. These headers include:

  • x-request-id
  • x-b3-traceid
  • x-b3-spanId
  • x-b3-parentspanid
  • x-b3-sampled
  • x-b3-flags
  • b3

If you are using LightStep, you will also need to forward the following headers:

  • x-ot-span-context

Header propagation may be accomplished through client libraries, such as Zipkin or Jaeger. It may also be accomplished manually, as documented in the Distributed Tracing Task.