My personal recommendations would be to
A ) Make the subject shorter, like "Reason for Absence" or "My Absence"
B ) Make the email more formal. (You don't have to copy my recommendation word for word but if you want to or use it for reference that works):
"Good Morning/Afternoon/Evening Mrs. __,
I hole you're have a lovely morning/afternoon/evening. Today I was absent and I apologize for the inconvenience. The class meeting didn't appear on my canvas courses and I couldn't find a zoom link. If there's anywhere I can find either one for the future please let me know and again I'm sorry for the inconvenience.
Sincerely,
__"
Eliezer soon discovers that the chimneys are pumping out the smoke from burning the bodies of the people that have been killed at the concentration camp. The smell coming from the chimneys is unknown at first, but soon they discover that it is the smell of burning flesh.
The only figurative language it could be would be a pun.