diff --git a/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Monitoring/HealthDashboardTests.cs b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Monitoring/HealthDashboardTests.cs
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+++ b/tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/Monitoring/HealthDashboardTests.cs
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+using Microsoft.Playwright;
+using ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Cluster;
+
+namespace ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests.Monitoring;
+
+/// <summary>
+/// End-to-end guard for the Health dashboard KPI tiles (<c>/monitoring/health</c>).
+///
+/// <para>
+/// The Health dashboard fans out to three Akka cluster-singleton <c>Ask</c>s every
+/// 10 s (Notification Outbox, Site Call, Audit) to populate nine KPI tiles. A
+/// previously-fixed bug caused those <c>Ask</c>s to hang, leaving every tile showing
+/// the em-dash degrade placeholder (<c>—</c>) instead of a resolved numeric value.
+/// This test guards that regression: it asserts that every tile resolves to a value
+/// and never shows <c>—</c>.
+/// </para>
+///
+/// <para>
+/// The three tile groups and their selectors:
+/// <list type="bullet">
+///   <item>
+///     <b>Notification Outbox</b> — inlined in <c>Health.razor</c> with no
+///     <c>data-test</c> attribute. Each is a Bootstrap <c>div.card</c> whose
+///     <c>.card-body</c> contains a value <c>h3</c> and a <c>small.text-muted</c>
+///     label. Located by the card that contains the label text, then its <c>h3</c>.
+///   </item>
+///   <item>
+///     <b>Audit</b> — rendered by <c>AuditKpiTiles.razor</c>; each tile button
+///     carries a <c>data-test</c> attribute: <c>audit-kpi-volume</c>,
+///     <c>audit-kpi-error-rate</c>, <c>audit-kpi-backlog</c>.
+///   </item>
+///   <item>
+///     <b>Site Calls</b> — rendered by <c>SiteCallKpiTiles.razor</c>; each tile
+///     button carries a <c>data-test</c> attribute: <c>site-call-kpi-buffered</c>,
+///     <c>site-call-kpi-stuck</c>, <c>site-call-kpi-parked</c>.
+///   </item>
+/// </list>
+/// </para>
+/// </summary>
+[Collection("Playwright")]
+public class HealthDashboardTests
+{
+    private const string HealthUrl = "/monitoring/health";
+
+    /// <summary>
+    /// The degrade placeholder rendered when a KPI loader faults — an em-dash
+    /// (U+2014). A healthy tile shows a non-negative integer instead.
+    /// </summary>
+    private const string DegradePlaceholder = "—"; // —
+
+    private readonly PlaywrightFixture _fixture;
+
+    public HealthDashboardTests(PlaywrightFixture fixture)
+    {
+        _fixture = fixture;
+    }
+
+    /// <summary>
+    /// Asserts that all nine KPI tiles on the Health dashboard resolve to numeric
+    /// values and do not show the em-dash degrade placeholder (<c>—</c>).
+    ///
+    /// <para>
+    /// A generous 20 s per-tile timeout is intentional: the tiles are populated
+    /// asynchronously after initial render as the three singleton <c>Ask</c>s
+    /// complete. The Playwright web-first assertion retries within that window
+    /// rather than using a fixed sleep, so a fast cluster will pass quickly.
+    /// </para>
+    /// </summary>
+    [SkippableFact]
+    public async Task KpiTiles_ResolveToValues_NotDegradePlaceholder()
+    {
+        Skip.IfNot(await ClusterAvailability.IsAvailableAsync(), ClusterAvailability.SkipReason);
+
+        var page = await _fixture.NewAuthenticatedPageAsync();
+        await page.GotoAsync($"{PlaywrightFixture.BaseUrl}{HealthUrl}");
+        await page.WaitForLoadStateAsync(LoadState.NetworkIdle);
+
+        // ── Notification Outbox tiles (no data-test; inlined in Health.razor as
+        //    plain div.card elements, not buttons — use that to disambiguate from
+        //    the SiteCallKpiTiles which render their cards as <button class="card">)
+        //    The Outbox section renders under the "Notification Outbox" h6 heading.
+        //    Scope by the exact small.text-muted label to pinpoint each tile's h3.
+
+        var queueDepthH3 = page.Locator("div.card", new() { HasText = "Queue Depth" }).Locator("h3");
+        // "Stuck" and "Parked" labels appear in both the Outbox section (div.card)
+        // and the Site Call tiles section (button.card). Discriminate on the element
+        // type: the Outbox tiles are <div class="card">, the Site Call tiles are
+        // <button class="card">. Using `div.card` (not `button.card`) ensures we
+        // select the Notification Outbox cards only.
+        var outboxStuckH3 = page.Locator("div.card", new() { HasText = "Stuck" }).Locator("h3");
+        var outboxParkedH3 = page.Locator("div.card", new() { HasText = "Parked" }).Locator("h3");
+
+        await AssertTileResolvedAsync(queueDepthH3, "Outbox Queue Depth");
+        await AssertTileResolvedAsync(outboxStuckH3, "Outbox Stuck");
+        await AssertTileResolvedAsync(outboxParkedH3, "Outbox Parked");
+
+        // ── Audit KPI tiles (AuditKpiTiles.razor — data-test on the button) ──
+
+        var auditVolume = page.Locator("[data-test='audit-kpi-volume']").Locator("h3");
+        var auditErrorRate = page.Locator("[data-test='audit-kpi-error-rate']").Locator("h3");
+        var auditBacklog = page.Locator("[data-test='audit-kpi-backlog']").Locator("h3");
+
+        await AssertTileResolvedAsync(auditVolume, "Audit Volume");
+        await AssertTileResolvedAsync(auditErrorRate, "Audit Error Rate");
+        await AssertTileResolvedAsync(auditBacklog, "Audit Backlog");
+
+        // ── Site Call KPI tiles (SiteCallKpiTiles.razor — data-test on the button) ──
+
+        var siteCallBuffered = page.Locator("[data-test='site-call-kpi-buffered']").Locator("h3");
+        var siteCallStuck = page.Locator("[data-test='site-call-kpi-stuck']").Locator("h3");
+        var siteCallParked = page.Locator("[data-test='site-call-kpi-parked']").Locator("h3");
+
+        await AssertTileResolvedAsync(siteCallBuffered, "Site Call Buffered");
+        await AssertTileResolvedAsync(siteCallStuck, "Site Call Stuck");
+        await AssertTileResolvedAsync(siteCallParked, "Site Call Parked");
+    }
+
+    /// <summary>
+    /// Waits up to 20 s for <paramref name="tileH3"/> to be non-empty and not
+    /// equal to the em-dash degrade placeholder.  Uses Playwright web-first
+    /// assertions so the retry loop is inside the Playwright engine, not a
+    /// C# busy-wait.
+    /// </summary>
+    private static async Task AssertTileResolvedAsync(ILocator tileH3, string tileName)
+    {
+        // The tile must be visible and contain text before we check its value.
+        await Assertions.Expect(tileH3)
+            .ToBeVisibleAsync(new() { Timeout = 20_000 });
+
+        // Primary guard: the value must NOT be the degrade placeholder.
+        await Assertions.Expect(tileH3)
+            .Not.ToHaveTextAsync(DegradePlaceholder, new() { Timeout = 20_000 });
+
+        // Secondary guard: the value must be non-empty — it should be a digit string.
+        await Assertions.Expect(tileH3)
+            .Not.ToBeEmptyAsync(new() { Timeout = 20_000 });
+
+        // Diagnostic: capture the resolved text for context in test output, but
+        // don't fail on any particular number (the cluster state is environment-
+        // dependent and any non-negative integer is valid).
+        var resolvedText = await tileH3.TextContentAsync();
+        Assert.True(
+            resolvedText != null && resolvedText.Trim().Length > 0,
+            $"KPI tile '{tileName}' resolved to null/empty content.");
+        Assert.False(
+            resolvedText!.Trim() == DegradePlaceholder,
+            $"KPI tile '{tileName}' shows the degrade placeholder '—' — singleton Ask likely hung or faulted.");
+    }
+}