@Override public Thread newThread(Runnable runnable) {
          return super.newThread(new Runnable() {
            @Override public void run() {
              RequestContextCurrentTraceContext.setCurrentThreadNotRequestThread(true);
              runnable.run();
            }

            @Override public String toString() {
              return runnable.toString();
            }
          });
        }
See {@link ThrottledCall#STORAGE_THROTTLE_MAX_CONCURRENCY} if unfamiliar with clearing trace on
exceptions only thrown from one spot.
zipkin-server/src/main/java/zipkin2/server/internal/throttle/ThrottledStorageComponent.java