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Datadog RUM: configuring allowed origins, CORS for intake endpoints, and PII scrubbing
List every production and preview domain in RUM settings; mismatched origins drop events silently.
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observabilitydatadogcors
Sampling
High sample rates multiply preflight volume—coordinate with API rate limits on your own origins too.
Use context attributes to tag tenant IDs without putting PII in URLs.
Synthetics
Private locations can emulate geographies; verify CORS separately from RUM beacons.
Correlate RUM errors with APM traces when headers propagate across services.