It looked like the use of the shim for pacing (from the data review info in Comment 3) was different than it's use as described for this request for save/dismiss interactions so I just wanted to make sure I wasn't misunderstanding the ask. I don't have any concerns about using the shim for save/dismiss; as with it's use for the clicks and impressions there's no change to the basic properties of the new tab collection. Let's make sure that these new events also are accounted for when the user deletes their data (see treatment in Bug 1553933). It should since its SPOC info associated with their ID.
Bug 1558905 Comment 7 Edit History
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It looked like the use of the shim for pacing (from the data review info in Comment 3) was different than it's use as described for this request for save/dismiss interactions so I just wanted to make sure I wasn't misunderstanding the ask. I don't have any concerns about using the shim for save/dismiss; as with its use for the clicks and impressions there's no change to the basic properties of the new tab collection. Let's make sure that these new events also are accounted for when the user deletes their data (see treatment in Bug 1553933). It should since its SPOC info associated with their ID.