code: public static void addFlowContext(final FlowContext flowContext) {
  
          if (null == flowContext) {
              clearFlowcontext();
              return;
          }
  
          FLOW_CONTEXT_THREAD_LOCAL.set(flowContext);
          MDC.put("flowCtxt", flowContext.toString());
      }
docs: Add flowContext to ThreadLocal when coming to another component.
  
  @param flowContext