Plan 04 Summary: Health Distribution Badge Counts on Dashboard

What Was Built

Added health status distribution counts to the dashboard. A new query in StatsQuery computes active source counts grouped by health_status (healthy, warning, declining, critical), rendered as color-coded inline badges below the existing stats cards. Health distribution metrics are recorded through the existing instrumentation pipeline.

Tasks Completed

1. Add health_distribution to StatsQuery -- Extended StatsQuery#call to include a health_distribution hash via Source.active.group(:health_status).count with zero-defaults for all four statuses.
2. Render health distribution badges on dashboard -- Added inline flex badges below stats cards in _stats.html.erb. Only non-zero statuses render. Colors match existing HealthBadgeHelper conventions.
3. Update Dashboard::Queries metrics recording -- Appended per-status gauge lines to record_stats_metrics (e.g., dashboard_stats_health_healthy).
4. Write tests for health distribution -- Created stats_query_test.rb with 4 test cases covering mixed counts, inactive exclusion, zero defaults, and empty active set.

Files Modified

• lib/source_monitor/dashboard/queries/stats_query.rb -- Added health_distribution key and private method
• app/views/source_monitor/dashboard/_stats.html.erb -- Added badge row with Turbo Stream targeting ID
• lib/source_monitor/dashboard/queries.rb -- Appended health gauge lines to record_stats_metrics
• test/lib/source_monitor/dashboard/queries_test.rb -- Fixed SQL count assertion (3 -> 4) and each_value type check for new hash key
• test/lib/source_monitor/dashboard/stats_query_test.rb -- NEW: 4 tests for health distribution query

Commits

• 0296be9 feat(dashboard): add health_distribution to StatsQuery
• d325251 feat(dashboard): render health distribution badges below stats cards
• a2b5997 feat(dashboard): record health distribution metrics as gauges
• d606f66 test(dashboard): add health distribution query tests

Deviations

• Updated existing queries_test.rb to fix two assertions broken by the new health_distribution hash key: the SQL query count check (3 -> 4 queries) and the each_value Integer type assertion (now skips the Hash-valued key).

Test Results

47 dashboard tests pass (36 existing + 4 new + 7 other dashboard tests), 0 failures, 0 errors.