Provide a performance bar link to the Jaeger UI
Jaeger is a distributed tracing tool. This change adds a "Tracing" link to the performance bar to directly link to a current request in Jaeger. This is useful for two reasons: 1 - it provides affordance to developers that the distributed tracing tool is available, so that it can quickly be discovered. 2 - it allows developers to quickly find a specific trace without having to manually navigate to a second user-interface.
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