Breaking change: Support for API v3 will be removed June 4
Jun 1, 2018James Ramsay

Summary
This post announces the removal of API v3 on June 4, 2018, and its complete removal in GitLab 11.0 on June 22, 2018. It urges users to upgrade integrations to API v4 before June 4 to avoid downtime and provides a link to upgrade documentation.