Final answer:
The dates after which KP Health Ally was adopted in each region, as opposed to the OTR app, would most likely be found in the training materials provided by Kaiser Permanente.
Step-by-step explanation:
The correct way to find out the dates after which KP Health Ally was adopted in each region, replacing the OTR app, would likely be by referring to the training materials provided by Kaiser Permanente. These materials are usually designed to inform employees and partners about new processes and software implementations. While other sources such as the KP app settings, the Kaiser Permanente website, or the app store description might offer some insights, they are less likely to provide a detailed adoption timeline for specific regions.
It's important to note that training materials are tailored to comprehensively educate staff on transitions and may include regional rollout schedules, making them an invaluable resource for this type of inquiry.