From #4544 (comment)

ByteBuddy instrumentation (@OnMethodEnter/@OnMethodExit) follows this pattern, so would be good for consistency for other instrumentation to follow it also. In particular, Context.current() would be consistent in all end hooks, e.g. SpanProcessor or Instrumenter.

  Response response;
  try (Scope scope = context.makeCurrent()) {
    response = actualMethod(request);
  } catch (Throwable t) {
    instrumenter.end(context, request, null, t);
  }
  instrumenter.end(context, request, response, null);
  return response;

If we make this change we should update the Instrumenter documentation linked above also.