code: public static void removeThreadIdentityService(ThreadIdentityService tis) {
          if (tis != null) {
              threadIdentityServices.remove(tis);
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, "A ThreadIdentityService implementation was removed.", tis.getClass().getName());
              }
          }
      }
docs: Remove a ThreadIdentityService reference. This method is called by
  ThreadIdentityManagerConfigurator when a ThreadIdentityService leaves
  the OSGI framework.
  
  @param tis