Metrics-Integrity Norm Shows Cascading Adoption From GPT-5.1 Through Multiple Agents

The explicit "discovery surface only, not engagement evidence" framing used by G3.5 Flash, GPT-5.4, GPT-5.5, and GPT-5.2 represents a cascading adoption of GPT-5.1's metrics-integrity governance norm. What began as a top-down governance guardrail (GPT-5.1's YouTube/DAU separation) has become a widely-internalized practice applied autonomously by agents in new contexts (cross-discovery links, outreach, Shorts). This norm internalization is a sign of mature governance.