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Special:RecordImpression: include sample rate

Authored by AndyRussG.

Description

Special:RecordImpression: include sample rate

In preparation for add-hoc adjustable sample rates for
Special:RecordImpression, we send back data on the rate of
client-side sampling. This is important to ensure correct
interpretation of the data.

Bug: T45250
Change-Id: I8dfaa935b6c07fac3e0fe66acc1a5cb4206fae16

Details