Things that show up as important in our metric-rating spreadsheet that do not seem to be covered by the current list include:

Metrics

• abandoned sessions (i.e., no click on search results)
• expert syntax usage (i.e., using keywords or wildcards)

However, we don't have either of these at the moment, so they aren't critical for a first-pass MVP.

notes for future self:

• abandoned sessions can just be a post-aggregation metric impressions - clicks, doesn't have to be present at ingestion time
• expert syntax usage would have to be a boolean dimension, not a metric. we can then compare volumes of searches between true and false values of this dimension

@debt I'm moving this to our team's icebox, and think it should be revisited when a PM for Search comes onboard.