Various C# continuations

extra/admin-api/Spacebar.Offload/Program.cs

@@ -1,7 +1,10 @@
+using System.Diagnostics.Metrics;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 using ArcaneLibs.Extensions;
 using Microsoft.EntityFrameworkCore;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Resources;
 using Spacebar.Interop.Authentication;
 using Spacebar.Interop.Authentication.AspNetCore;
 using Spacebar.Models.Db.Contexts;
@@ -12,11 +15,28 @@ if (!string.IsNullOrWhiteSpace(Environment.GetEnvironmentVariable("APPSETTINGS_P
     builder.Configuration.AddJsonFile(Environment.GetEnvironmentVariable("APPSETTINGS_PATH")!);
 
 // Add services to the container.
+builder.Services.AddOpenTelemetry()
+    .ConfigureResource(resource=> {
+        resource.AddService(serviceName: builder.Environment.ApplicationName, serviceNamespace: builder.Environment.ApplicationName);
+    })
+    .WithMetrics(builder =>
+    {
+        builder.AddPrometheusExporter();
+        
+        builder.AddMeter("Microsoft.AspNetCore.Hosting", "Microsoft.AspNetCore.Server.Kestrel", "System.Runtime", "Microsoft.Extensions.Diagnostics.ResourceMonitoring", "Microsoft.AspNetCore.Routing", "Microsoft.AspNetCore.Diagnostics", "Microsoft.AspNetCore.RateLimiting", "Microsoft.AspNetCore.HeaderParsing", "Microsoft.AspNetCore.Server.Kestrel");
+        builder.AddView("http.server.request.duration",
+            new ExplicitBucketHistogramConfiguration
+            {
+                Boundaries = [0.0, 0.001, 0.005, 0.01, 0.025, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.75, 1.0, 1.25, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 10]
+            });
+    });
 
-builder.Services.AddControllers(options => {
+builder.Services.AddControllers(options =>
+{
     options.MaxValidationDepth = null;
     // options.MaxIAsyncEnumerableBufferLimit = 1;
-}).AddJsonOptions(options => {
+}).AddJsonOptions(options =>
+{
     options.JsonSerializerOptions.DefaultIgnoreCondition = JsonIgnoreCondition.Never;
     options.JsonSerializerOptions.WriteIndented = true;
     options.JsonSerializerOptions.MaxDepth = 100;
@@ -25,7 +45,8 @@ builder.Services.AddControllers(options => {
 // Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
 builder.Services.AddOpenApi();
 
-builder.Services.AddDbContextPool<SpacebarDbContext>(options => {
+builder.Services.AddDbContextPool<SpacebarDbContext>(options =>
+{
     options
         .UseNpgsql(builder.Configuration.GetConnectionString("Spacebar"))
         .EnableDetailedErrors();
@@ -37,8 +58,11 @@ builder.Services.AddScoped<SpacebarAspNetAuthenticationService>();
 
 var app = builder.Build();
 
+app.MapPrometheusScrapingEndpoint();
+
 // Configure the HTTP request pipeline.
-if (app.Environment.IsDevelopment()) {
+if (app.Environment.IsDevelopment())
+{
     app.MapOpenApi();
 }
 

extra/admin-api/Spacebar.Offload/Spacebar.Offload.csproj

@@ -12,6 +12,8 @@
 
     <ItemGroup>
         <ProjectReference Include="..\DataMappings\Spacebar.DataMappings.Generic\Spacebar.DataMappings.Generic.csproj"  Condition="'$(ContinuousIntegrationBuild)'!='true'"/>
+        <PackageReference Include="OpenTelemetry.Exporter.Prometheus.AspNetCore" Version="1.16.0-beta.1" />
+        <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.16.0" />
         <PackageReference Include="Spacebar.DataMappings.Generic" Version="*-preview*" Condition="'$(ContinuousIntegrationBuild)'=='true'"/>
         <ProjectReference Include="..\Interop\Spacebar.Interop.Authentication.AspNetCore\Spacebar.Interop.Authentication.AspNetCore.csproj" Condition="'$(ContinuousIntegrationBuild)'!='true'"/>
         <PackageReference Include="Spacebar.Interop.Authentication.AspNetCore" Version="*-preview*" Condition="'$(ContinuousIntegrationBuild)'=='true'"/>