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@@ -333,3 +333,7 @@ workings of gubernator.
 ## Monitoring
 Gubernator publishes Prometheus metrics for realtime monitoring.  See
 [prometheus.md](prometheus.md) for details.
+
+## Jaeger Tracing
+Gubernator supports tracing using Jaeger Tracing tools.  See
+[jaegertracing.md](jaegertracing.md) for details.
diff --git a/jaegertracing.md b/jaegertracing.md
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+# Jaeger Tracing
+Gubernator supports [OpenTracing](https://opentracing.io) for generating
+detailed traces of server behavior using [Jaeger
+Tracing](https://www.jaegertracing.io/) tools.
+
+## Enabling Jaeger
+Jaeger is enabled by default and sends traces to localhost port 6831/udp.
+
+Configure with environment variables, such as:
+
+| Name                   | Description |
+| ---------------------- | ----------- |
+| `JAEGER_SERVICE_NAME`  | Service name. |
+| `JAEGER_AGENT_HOST`    | Jaeger server hostname or IP. |
+| `JAEGER_SAMPLER_TYPE`  | The sampler type: `remote`, `const`, `probablistic`, or `ratelimiting`. |
+| `JAEGER_SAMPLER_PARAM` | The sampler parameter. |
+| `JAEGER_DISABLED`      | Set to `true` to disable sending Jaeger traces. |
+
+See also the [full list of variables](https://github.com/jaegertracing/jaeger-client-go#environment-variables).
+
+## Sampling
+Because Gubernator generates a trace for each request, it is recommended to use
+`probablistic` or `ratelimiting` [sampler
+type](https://www.jaegertracing.io/docs/1.30/sampling/) to reduce the volume of
+data sent to your Jaeger server.
+
+## Distributed Traces
+OpenTracing defines capabilities for clients to send trace ids to downstream
+services.  That service will link the client span with the server span.  When
+the client and server both send traces to the same Jaeger server, the trace
+will appear with the two spans linked in the same view.
+
+See `tracing/tracing.go` for usage examples.
+
+### Gubernator Standlone
+When deployed as a standalone daemon, Gubernator's gRPC service will receive
+embedded trace ids in requests from the client's `context` object.
+
+For this to work, the client must be configured to embed tracing ids.
+
+#### gRPC
+If using Gubernator's Golang gRPC client, the client must be created like so:
+
+```go
+    import (
+        "github.com/opentracing/opentracing-go"
+        otgrpc "github.com/opentracing-contrib/go-grpc"
+        "google.golang.org/grpc"
+    )
+
+    // ...
+
+    tracer := opentracing.GlobalTracer()
+    tracingUnaryInterceptor := otgrpc.OpenTracingClientInterceptor(tracer)
+    tracingStreamInterceptor := otgrpc.OpenTracingStreamClientInterceptor(tracer)
+
+    opts := []grpc.DialOption{
+        grpc.WithBlock(),
+        grpc.WithUnaryInterceptor(tracingUnaryInterceptor),
+        grpc.WithStreamInterceptor(tracingStreamInterceptor),
+    }
+
+    endpoint := "<your-endpoint>"
+    conn, err := grpc.DialContext(ctx, endpoint, opts...)
+```
+
+#### HTTP
+If using HTTP, the tracing ids must be embedded in HTTP headers.  This is
+typically done using Jaeger client functionality.
+
+See: https://medium.com/opentracing/distributed-tracing-in-10-minutes-51b378ee40f1
+
+### Gubernator Module
+When embedded into a dependent codebase as a Go module, most all Gubernator
+functions create spans linked to the trace ids embedded into the `context`
+object.
+
+Follow the same steps to configure your codebase as the Gubernator standalone,
+above.