add distributed tracing

radar/2019-11-01/distributed-tracing.md

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+---
+title:      "Distributed Tracing"
+ring:       trial
+quadrant:   methods-and-patterns
+
+---
+
+Distributed Tracing creates visibility over processes spanning multiple applications.
+In a microservice world where a request or operation involves multiple applications it is helpful to have an overview of what system is involved, at what point.
+Also visibility of communicated data and errors helps to quickly identify issues in a microservice environment.
+Our tool of choice is [Jaeger](https://www.jaegertracing.io/) with [B3 Propagation](https://github.com/openzipkin/b3-propagation).