React Dashboard Query API — Hosted Metrics for Tenant Experiment Attribution

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TL;DR: Choose a hosted metrics query API only after proving that every experiment series can carry a stable tenant-cohort identifier, a bounded time range, and an attributable ingestion and retention cost. Put a Node.js boundary between React and the provider, return one small response contract for cards and charts, and reject unbounded queries. A convenient query endpoint cannot repair ambiguous cohort membership or uncontrolled label cardinality. For a B2B SaaS admin panel, the operational decision rule is blunt: if finance cannot map the experiment's telemetry volume to a cohort, and the on

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