This the Reuters story on first Hezb attack in the conflict after Oct 7.
Hezb attacked military outposts on the Sheba farms, its countrys own territory, which Israel occupies. It was basically a symbolic act in support of the Palestinian ppl. Despite Hezb "mostly" confining their attacks to military targets, they do respond in kind when Israel hits Leb civs. There is comparative chart posted earlier shows the overwhelming Israeli scale of attacks vs Hezbs attacks.
Israel basically escalated this out of proportion knowing that this would serve as a good excuse to take out Hezb when the time was right.