Israel's representative "calls on the Security Council to address Hezbollah's clear and increasingly dangerous violations of UN Security Council Resolution 1701, and to condemn in the strongest terms Iran and Hezbollah for destabilizing the region."

Source: https://today.lorientlejour.com/article/1345183/israel-files-complaint-against-lebanon-with-un-security-council.html

So far, no organization has taken responsibility for the rocket fire, though Israel believes that it could not have taken place without Hezbollah's approval.

Source: https://www.al-monitor.com/originals/2023/04/barrage-rockets-hits-israel-lebanon-border-escalation-mounts