Logging from Go

package main

import (
	"context"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/log"
)

func main() {
	// Get the logger from the global logger provider
	loggerProvider := otel.GetLoggerProvider()
	logger := loggerProvider.Logger("my-app")

	// Log a message
	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityInfo,
		Body:     log.StringValue("Log message line"),
	})
}

package main

import (
	"context"
	"log/slog"
	"go.opentelemetry.io/contrib/bridges/otelslog"
)

func main() {
	// Create an OpenTelemetry `slog` handler
	otelHandler := otelslog.NewHandler("my-app")

	// Create a `slog` logger with the OpenTelemetry handler
	logger := slog.New(otelHandler)

	// Use the logger
	logger.Info("Log message line")
	logger.With("user_id", 123).Info("User logged in")
	logger.Error("An error occurred", "error", "database connection failed")
}

package main

import (
	"context"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/log"
)

func main() {
	loggerProvider := otel.GetLoggerProvider()
	logger := loggerProvider.Logger("my-app")

	// Different severity levels
	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityWarn,
		Body:     log.StringValue("Something went wrong"),
	})

	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityInfo,
		Body:     log.StringValue("Action completed"),
	})

	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityError,
		Body:     log.StringValue("Database connection failed"),
	})
}

package main

import (
	"context"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/log"
)

func processInvoice(customerID string) {
	loggerProvider := otel.GetLoggerProvider()
	logger := loggerProvider.Logger("invoice_helper")

	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityInfo,
		Body:     log.StringValue("Generating invoice for customer"),
		Attributes: []log.KeyValue{
			log.String("customer_id", customerID),
		},
	})

	invoice := generateInvoice(customerID)

	logger.Emit(context.Background(), log.Record{
		Severity: log.SeverityInfo,
		Body:     log.StringValue("Generated invoice for customer"),
		Attributes: []log.KeyValue{
			log.String("customer_id", customerID),
			log.String("invoice_id", invoice.ID),
		},
	})
}