The issue has been identified and we are rolling through updates to all customer sites.
Posted Feb 28, 2019 - 16:36 PST
An Issue with Developer Portals has been identified and we are in the process of applying fixes. Some developer portal sites will experience sites not loading, when menu items link to invalid pages. We expect a fix momentarily.
Posted Feb 28, 2019 - 13:14 PST
This incident affected: Developer Portal (Integrated).