Replace unused server metrics with a count (Refs #139)

tests/unit/ui-metrics-page.test.ts

@@ -1,11 +1,6 @@
 import { beforeEach, expect, it, vi } from 'vitest';
 import { render } from 'svelte/server';
-import type {
-    MetricsData,
-    MapMetrics,
-    ServerMetrics,
-    MatchMetrics
-} from '../../src/lib/metrics.js';
+import type { MetricsData, MapMetrics, MatchMetrics } from '../../src/lib/metrics.js';
 import MetricsPage from '../../src/routes/metrics/+page.svelte';
 import MetricsSummary from '../../src/lib/ui/components/metrics/MetricsSummary.svelte';
 import MetricsTables from '../../src/lib/ui/components/metrics/MetricsTables.svelte';
@@ -53,15 +48,6 @@ const map = (i: number, changes: Partial<MapMetrics> = {}): MapMetrics => ({
     policy: null,
     ...changes
 });
-const server = (i: number): ServerMetrics => ({
-    server: `t5_zombie_theater_${i}`,
-    currentRegistered: i !== 1,
-    observed: 10,
-    active: i / 10,
-    idle: 10 - i / 10,
-    unknown: 0,
-    playerHours: i
-});
 function report(): MetricsData {
     const now = Date.parse('2026-10-06T12:00:00Z');
     const summary = { observed: 10, active: 5, idle: 5, unknown: 2, playerHours: 20 };
@@ -81,7 +67,7 @@ function report(): MetricsData {
         summary,
         running: { average: 12, peak: 24, capturedHours: 1 },
         maps: Array.from({ length: 24 }, (_, i) => map(i + 1)),
-        servers: Array.from({ length: 24 }, (_, i) => server(i + 1)),
+        sampledServerCount: 24,
         points: [
             {
                 ...summary,
@@ -120,6 +106,28 @@ function scope(search: string, stateSearch?: string) {
 }
 beforeEach(() => scope(''));
 
+it.each([
+    [0, 'No captured time in this scope'],
+    [1, 'Waiting for observed time']
+] as const)('uses the sampled-server count %i for the empty state', (sampledServerCount, title) => {
+    const data = report();
+    data.summary = { observed: 0, active: 0, idle: 0, unknown: 0, playerHours: 0 };
+    data.running = { average: null, peak: 0, capturedHours: 0 };
+    data.matches = matches({
+        started: 0,
+        withRecordedPlayers: 0,
+        averageGroupSize: null,
+        solo: 0,
+        soloShare: null
+    });
+    data.maps = [];
+    data.sampledServerCount = sampledServerCount;
+    const body = render(MetricsPage, {
+        props: { data: { ...data, user: null, setupRequired: false } }
+    }).body;
+    expect(body).toContain(title);
+});
+
 it('shows a summary and one paginated breakdown, preserving scope on range links', () => {
     scope('?game=t5&days=7&view=maps&mapPage=2');
     const body = render(MetricsPage, {
@@ -271,7 +279,7 @@ it('keeps match summaries and map rows visible without any retained occupancy sa
     data.firstRetainedSampleAt = null;
     data.scopeFirstSampleAt = null;
     data.scopeLatestSampleAt = null;
-    data.servers = [];
+    data.sampledServerCount = 0;
     data.maps = [
         map(1, {
             ...data.summary,