Continuous Cloud

If your sandbox received the September Portfolios release between Monday, September 7th at 2:00 a.m. UTC and Tuesday, September 9th at 6:00 p.m. UTC, a targeted patch will be applied on Thursday, September 11th between 1:00 p.m. and 10:00 p.m. UTC. Sandbox environments will be unavailable for approximately 60-120 minutes during this window.

This patch will not affect production deployments, and there are no delays expected.
If your sandbox received the September release after Tuesday, September 9th at 6:00 p.m. UTC, you can safely ignore this notice.