initial commit

.gitignore

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+*.swp
+*.*~
+project.lock.json
+.DS_Store
+*.pyc
+nupkg/
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+
+# Rider
+.idea/
+
+# Visual Studio
+.vs/
+
+# Fleet
+.fleet/
+
+# Code Rush
+.cr/
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+build/
+bld/
+[Bb]in/
+[Oo]bj/
+[Oo]ut/
+msbuild.log
+msbuild.err
+msbuild.wrn
+
+# Node.js build artifacts
+node_modules/
+package-lock.json
+package.json

LoggingApi.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OpenTelemetry" Version="1.15.0" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.0" />
+  </ItemGroup>
+
+</Project>

LoggingApi.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LoggingApi", "LoggingApi.csproj", "{06EE0C43-C200-C32E-7D42-5A6E5B7F26C8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{06EE0C43-C200-C32E-7D42-5A6E5B7F26C8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{06EE0C43-C200-C32E-7D42-5A6E5B7F26C8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{06EE0C43-C200-C32E-7D42-5A6E5B7F26C8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{06EE0C43-C200-C32E-7D42-5A6E5B7F26C8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A4C3FE80-F377-4609-9507-B69321D4CB00}
+	EndGlobalSection
+EndGlobal

Program.cs

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+using OpenTelemetry.Logs;
+
+var builder = WebApplication.CreateBuilder(args);
+
+var useOtlpExporter = !string.IsNullOrWhiteSpace(builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"]);
+
+builder.Logging.AddOpenTelemetry(logging =>
+{
+    logging.IncludeFormattedMessage = true;
+    logging.IncludeScopes = true;
+
+    if (useOtlpExporter)
+    {
+        logging.AddOtlpExporter();
+    }
+    else
+    {
+        Console.WriteLine("OTEL_EXPORTER_OTLP_ENDPOINT is not set. Skipping OTLP exporter configuration.");
+    }
+});
+
+var app = builder.Build();
+
+app.MapGet("/", () => "Hello World!");
+
+app.MapGet("/log", (ILogger<Program> logger) =>
+{
+    if (logger.IsEnabled(LogLevel.Information))
+        logger.LogInformation("Logging a message at {time:HH:mm:ss} on {machine}", DateTime.Now, Environment.MachineName);
+    return Results.Ok();
+});
+
+app.Run();

Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "http://localhost:5171",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:7247;http://localhost:5171",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "OTEL_EXPORTER_OTLP_ENDPOINT": "http://localhost:4317",
+  "OTEL_SERVICE_NAME": "LoggingApi"
+}

appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

compose.yml

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+services:
+  alloy:
+    image: grafana/alloy:v1.13.1
+    ports:
+      - 12345:12345
+      - 4317:4317
+      - 4318:4318
+    volumes:
+      - ./config.alloy:/etc/alloy/config.alloy
+    command: run --server.http.listen-addr=0.0.0.0:12345 --storage.path=/var/lib/alloy/data /etc/alloy/config.alloy
+    depends_on:
+      - loki
+
+  loki:
+    image: grafana/loki:3.5.10
+    volumes:
+      - ./loki-config.yaml:/etc/loki/local-config.yaml
+      - loki-data:/loki
+    command: -config.file=/etc/loki/local-config.yaml
+  
+  grafana:
+    image: grafana/grafana:12.3
+    environment:
+      - GF_FEATURE_TOGGLES_ENABLE=grafanaManagedRecordingRules
+      - GF_AUTH_ANONYMOUS_ORG_ROLE=Admin
+      - GF_AUTH_ANONYMOUS_ENABLED=true
+      - GF_AUTH_BASIC_ENABLED=false
+    ports:
+      - 3001:3000/tcp
+    entrypoint:
+       - sh
+       - -euc
+       - |
+         mkdir -p /etc/grafana/provisioning/datasources
+         cat <<EOF > /etc/grafana/provisioning/datasources/ds.yaml
+         apiVersion: 1
+         datasources:
+         - name: Loki
+           type: loki
+           access: proxy
+           orgId: 1
+           url: 'http://loki:3100'
+           basicAuth: false
+           isDefault: true
+           version: 1
+           editable: true
+         EOF
+         /run.sh
+
+volumes:
+  loki-data:

config.alloy

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+otelcol.receiver.otlp "default" {
+  http {
+    endpoint = "0.0.0.0:4318"
+  }
+  grpc {
+    endpoint = "0.0.0.0:4317"
+  }
+
+  output {
+    logs    = [otelcol.processor.batch.default.input]
+  }
+}
+
+otelcol.processor.batch "default" {
+  output {
+    logs = [otelcol.exporter.otlphttp.loki.input]
+  }
+}
+
+otelcol.exporter.otlphttp "loki" {
+  client {
+    endpoint = "http://loki:3100/otlp"
+  }
+}

loki-config.yaml

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+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+
+common:
+  ring:
+    instance_addr: 127.0.0.1
+    kvstore:
+      store: inmemory
+  replication_factor: 1
+  path_prefix: /loki
+
+schema_config:
+  configs:
+    - from: 2020-05-15
+      store: tsdb
+      object_store: filesystem
+      schema: v13
+      index:
+        prefix: index_
+        period: 24h
+
+storage_config:
+  filesystem:
+    directory: /loki/chunks
+
+compactor:
+  working_directory: /loki/compactor
+  retention_enabled: true
+  compaction_interval: 24h
+  delete_request_store: filesystem
+
+limits_config:
+  retention_period: 720h # 30 days