Make metrics reflect autoscaling policies (Refs #137)

tests/unit/ui-metrics.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest';
 import {
     compareMetricValues,
+    metricAverageLobbies,
     metricDuration,
     metricNumber,
     metricPercent,
@@ -8,6 +9,14 @@ import {
 } from '../../src/lib/ui/metrics.js';
 
 describe('metric presentation', () => {
+    it('normalizes partial buckets by captured wall time and preserves unknown lobby counts', () => {
+        expect(metricAverageLobbies(14 * 24, 24)).toBe(14);
+        expect(metricAverageLobbies(14 * 0.5, 0.5)).toBe(14);
+        expect(metricAverageLobbies(12 + 2, 1)).toBe(14);
+        expect(metricAverageLobbies(0, 1)).toBe(0);
+        expect(metricAverageLobbies(0, 0)).toBeNull();
+        expect(metricAverageLobbies(4, Number.NaN)).toBeNull();
+    });
     it('distinguishes unavailable evidence, zero, and tiny nonzero values', () => {
         expect(metricPercent(0, 0)).toBe('—');
         expect(metricPercent(0, 1)).toBe('0.0%');