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pbjs.enableAnalytics(config)
Enables sending analytics data to the analytics provider of your choice. For a list of analytics adapters, see Analytics for Prebid.
Note that each analytics adapter has it’s own invocation parameters. Analytics adapters that are built in the standard way should
support a sampling option. You’ll need to check with your analytics provider to confirm
whether their system recommends the use of this parameter. They may have alternate methods of sampling.
pbjs.enableAnalytics([{
    provider: "analyticsA",
    options: {
        providerSpecificParams: ...
        sampling: 0.25          // only call the analytics adapter this percent of the time
    }
}]);
To learn how to build an analytics adapter, see How to Add an Analytics Adapter.