tracer: prevent race when updating SpanURL
Created by: keegancsmith
If someone adjusts the external URL or jaeger configuration, we will update the "SpanURL" function. Previously this caused a race condition. We add synchronisation around it.
Created by: keegancsmith
If someone adjusts the external URL or jaeger configuration, we will update the "SpanURL" function. Previously this caused a race condition. We add synchronisation around it.