ToolsPack.Logging.Otlp 0.1.0

ToolsPack.Logging.Oltp

In the current .NET OLTP (v1.10.0) implementation, the LogRecord class is not serializable. It contains a lot of interesting OpenTelemetry information, mixing with other logics. IMO, actual implementation of this class should rather be called LogRecordKitchenSink than LogRecord.

This nuget library provides a mapping of the LogRecord "kitchen sink" object to a serializable LogRecordDto object: Checkout the LogRecordConverter class. It should facilitate you to develop your own custom exporter (File, Console...).

The library also provides simple implementation of Console and File exporter which will format the telemetry log records to json.

Log to Console

using System.Diagnostics;
using Microsoft.Extensions.Logging;
using OpenTelemetry;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;
using ToolsPack.Logging.Otlp;

var resourceBuilder = ResourceBuilder.CreateDefault().AddService("my-service");
ActivitySource activitySource = new("LogScopeTests", "1.0.0");

using var tracerProvider = Sdk.CreateTracerProviderBuilder()
    .SetResourceBuilder(resourceBuilder)
    .AddSource("LogScopeTests")
    .Build();

var loggerFactory = LoggerFactory.Create(builder =>
    builder.AddOpenTelemetry(options =>
    {
        options.SetResourceBuilder(resourceBuilder);
        options.IncludeScopes = true;
        options.IncludeFormattedMessage = true;
        options.AddProcessor(new SimpleLogRecordExportProcessor /*or BatchLogRecordExportProcessor*/(
            new JsonConsoleLogsExporter(exporterOptions =>
            {
                exporterOptions.JsonSerializerOptions.IndentSize = 2;
                exporterOptions.JsonSerializerOptions.WriteIndented = true;
            })
        ));
    })
);
var logger = loggerFactory.CreateLogger("G");
using (activitySource.StartActivity())
{
    logger.LogInformation("Hello {thing}!", "World");
}
/*
{
  "timestamp": "2024-12-31T20:43:40.8521675Z",
  "traceId": "f8c7dc7c4fee9f0dfb2a1c2a42a08c84",
  "spanId": "52e69b4fb2fbde5f",
  "traceFlags": 1,
  "categoryName": "G",
  "severity": 2,
  "formattedMessage": "Hello World!",
  "eventId": {
    "id": 0
  },
  "body": "Hello {thing}!",
  "attributes": {
    "thing": "World",
    "{OriginalFormat}": "Hello {thing}!"
  },
  "scopeValues": [],
  "resource": {
    "service.name": "my-service",
    "service.instance.id": "c983b8ce-cdf4-4cb0-8da6-b30ba6192ca6",
    "telemetry.sdk.name": "opentelemetry",
    "telemetry.sdk.language": "dotnet",
    "telemetry.sdk.version": "1.10.0"
  }
}

*/

Log to file

using Microsoft.Extensions.Logging;
using OpenTelemetry;

var loggerFactory = LoggerFactory.Create(builder =>
    builder.AddOpenTelemetry(options =>
    {
        options.AddProcessor(new SimpleLogRecordExportProcessor /*or BatchLogRecordExportProcessor*/(
            new JsonFileLogsExporter(exporterOptions => { 
                exporterOptions.FilePath = "./app.log"; 
            })
        ));
    })
);
var logger = loggerFactory.CreateLogger("G");
logger.LogInformation("Hello World");