MD-Mushfiqur123 opened a new pull request, #67549:
URL: https://github.com/apache/airflow/pull/67549
## Problem
The dashboard "Historical Metrics" section shows incorrect percentages
because the API endpoint `/ui/dashboard/historical_metrics_data` caps per-state
counts at `STATE_COUNT_CAP = 1000` (for performance), but the frontend computes
the total as the sum of these capped values and uses it as the denominator for
percentage calculations.
For example, if `success` has 100,000 task instances and every other state
has 0, the API returns `success: 1000` (capped) while all others are 0. The
frontend computes `total = 1000` and shows `success: 100%`. With many states
hitting the cap, the total itself is wrong and percentages are meaningless.
## Fix
Return the real uncapped total counts (`dag_run_total_count` and
`task_instance_total_count`) alongside the existing capped per-state counts.
The frontend now uses these uncapped totals as the denominator for percentage
and progress-bar computations.
This is a minimal, backward-compatible change that:
- Adds two `COUNT(*)` queries (fast aggregate queries with the same filters)
- Adds two fields to the API response
- Updates the frontend to use the uncapped totals instead of summing capped
values
- Preserves the existing capped display behavior ("N+" indicator, bar
expansion, percentage hiding) when a state hits the limit
Closes #67336
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