What solution is suggested for tracking digital touchpoints where Dynatrace OneAgent cannot be installed?

OpenKit is the correct solution for tracking digital touchpoints where Dynatrace OneAgent cannot be installed. OpenKit is a lightweight SDK that allows developers to instrument and track application performance in client-side environments like mobile apps and web front-ends. This is especially useful in scenarios where the OneAgent's capabilities cannot be utilized, such as environments without permissions to install agents or when dealing with client-side technologies that the OneAgent does not support.

In contrast, the other options do not directly address the need for tracking in scenarios where OneAgent installation is not feasible. Third-party analytics may provide insights but typically do not offer the same level of integration or detailed telemetry that OpenKit provides specifically for Dynatrace. Custom scripting might allow for tracking but usually requires significant development effort and may not seamlessly integrate with existing Dynatrace frameworks. API Gateway Integration could facilitate communication but does not inherently provide the capabilities needed for tracking user interactions in environments outside the OneAgent's reach.