App Engine Production Upgrading To 1.8.4

App Engine is currently upgrading all applications to the 1.8.4 runtime. Here’s how the upgrade process looks on a free tier application.

On the main administration screen, this notice appears:

Clicking the Details link brings you to the Instances page, where this shows up:

The first instance loaded under the 1.8.4 runtime was launched on August 25, 14:43 PDT: