ANR Rate scorecard and chart show non-comparable values

On the Android project details page, the ANR Rate scorecard (top row) and the ANR Rate chart display values that can appear contradictory — e.g. a scorecard of 0.81% while the chart's highest daily point is only 0.27% for the same date range.

Both widgets query the same anr_rate() derived metric (anr_user_count / all_user_count, unique users), but at different granularities: the scorecard aggregates unique users across the full selected period (includeSeries: false), while the chart computes the ratio per daily bucket (getSessionsInterval with dailyInterval: true). Because "unique user" counts don't dedupe consistently across different window sizes, the ratios aren't averageable across buckets — the period-aggregate value can legitimately exceed the highest single-day bucket value. This is not a computation bug, but it produces a confusing, seemingly-contradictory pair of numbers on the same page.

Proposed UX improvements (not yet validated against design/product priorities):

• Add scope-qualifying labels/tooltips distinguishing "period aggregate" vs. "daily" ANR rate (e.g. scorecard help text vs. chart axis/legend copy).
• Show the period-aggregate value as a reference line/annotation on the chart so the two numbers are visually connected.
• Consider a toggle for chart bucket size (daily/weekly/cumulative) so it can visually converge toward the scorecard aggregate.

Related prior issue on the same category of problem (aggregate vs. time-bucketed rate mismatch): #58396.

via Michael Chai.

--

View Junior Session [Sentry]

Start at the Android project details page and inspect the ANR Rate scorecard and chart, including their shared anr_rate() metric and differing aggregation paths. Review related issue #58396 and validate the proposed UX direction with design or product; done means the period aggregate and daily values are clearly distinguished and no longer appear contradictory.