feat: map canonical ZB health tiers; replace bypassing /health/live

src/ZB.MOM.WW.MxGateway.Server/GatewayApplication.cs

@@ -2,6 +2,7 @@ using System.Security.Cryptography.X509Certificates;
 using Microsoft.AspNetCore.Hosting.StaticWebAssets;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Configuration;
+using ZB.MOM.WW.Health;
 using ZB.MOM.WW.MxGateway.Contracts;
 using ZB.MOM.WW.MxGateway.Server.Alarms;
 using ZB.MOM.WW.MxGateway.Server.Configuration;
@@ -63,7 +64,11 @@ public static class GatewayApplication
         builder.Services.AddGatewayConfiguration();
         builder.Services.AddSqliteAuthStore();
         builder.Services.AddGatewayGrpcAuthorization();
-        builder.Services.AddHealthChecks();
+        builder.Services.AddHealthChecks()
+            .AddTypeActivatedCheck<AuthStoreHealthCheck>(
+                "auth-store",
+                failureStatus: null,
+                tags: new[] { ZbHealthTags.Ready });
         builder.Services.AddSingleton<GatewayMetrics>();
         builder.Services.AddSingleton<MxAccessGrpcMapper>();
         builder.Services.AddSingleton<MxAccessGrpcRequestValidator>();
@@ -169,13 +174,7 @@ public static class GatewayApplication
     {
         endpoints.MapStaticAssets(ResolveStaticAssetsManifestPath());
 
-        endpoints.MapGet(
-                "/health/live",
-                () => Results.Ok(new GatewayHealthReply(
-                    Status: "Healthy",
-                    DefaultBackend: GatewayContractInfo.DefaultBackendName,
-                    WorkerProtocolVersion: GatewayContractInfo.WorkerProtocolVersion)))
-            .WithName("LiveHealth");
+        endpoints.MapZbHealth();
 
         endpoints.MapGrpcService<MxAccessGatewayService>();
         endpoints.MapGrpcService<GalaxyRepositoryGrpcService>();

src/ZB.MOM.WW.MxGateway.Tests/Gateway/GatewayApplicationTests.cs

@@ -11,19 +11,22 @@ namespace ZB.MOM.WW.MxGateway.Tests.Gateway;
 
 public sealed class GatewayApplicationTests
 {
-    /// <summary>Verifies that Build maps the live health check endpoint.</summary>
+    /// <summary>Verifies that Build maps the canonical three health tiers.</summary>
     [Fact]
-    public async Task Build_MapsLiveHealthEndpoint()
+    public async Task Build_MapsCanonicalHealthEndpoints()
     {
         await using WebApplication app = GatewayApplication.Build([]);
 
-        RouteEndpoint endpoint = Assert.Single(
-            ((IEndpointRouteBuilder)app).DataSources
-                .SelectMany(dataSource => dataSource.Endpoints)
-                .OfType<RouteEndpoint>(),
-            candidate => candidate.RoutePattern.RawText == "/health/live");
+        var paths = ((IEndpointRouteBuilder)app).DataSources
+            .SelectMany(dataSource => dataSource.Endpoints)
+            .OfType<RouteEndpoint>()
+            .Select(e => e.RoutePattern.RawText)
+            .ToHashSet();
 
-        Assert.Equal("LiveHealth", endpoint.Metadata.GetMetadata<IEndpointNameMetadata>()?.EndpointName);
+        Assert.Contains("/health/ready", paths);
+        Assert.Contains("/health/active", paths);
+        Assert.Contains("/healthz", paths);
+        Assert.DoesNotContain("/health/live", paths);
     }
 
     /// <summary>Verifies that Build registers the gateway metrics service.</summary>