Barry Allen He told his friends (Cisco and Caitlin in particular but he also definitely talked to Caroline that he felt like he needed to go home to his mission to stop Devoe and etc)
John Murphy - No Info.
Sean Cassidy told Theresa
Annie told Hal and Tom that she wanted to pass over into heaven than stay here.
*keep in mind that with glitches, all your character knows ICly is that they didn't tell them they were leaving. Whether they chose to leave without saying anything or a glitch happened is purely for OOC knowledge.