This analysis reveals visibility ceilings for drift detection in telemetry through a new formula linking divergence and privacy.
Exact contraction coefficient for Jensen–Shannon divergence under m-ary randomized response with closed-form formula. Establishes hard visibility ceilings for drift detection in locally differentially private telemetry pipelines. Note: The formula coincides with the known χ²-contraction coefficient — a non-trivial consequence of RR symmetry.
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Alex Shvets (2026) studied this question.
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