Transports weakening, an ominous sign for the markets?

After making new highs in 2021, the transport ETF has failed to push to new highs on multiple occasions. This similar chart pattern also took place in 2008. There's an unfilled gap in the $148-152 level. That would be a logical target when/if this weakness continues. This is also a potential ominous sign for the overall markets if the 2008 playbook is repeating itself.....