Fix OpenTelemetry error handling & update README

Author: KillianMeersman

README.md

@@ -56,6 +56,6 @@ response = requests.get("http://example.com", proxies=proxies, headers={"X-Upgra
 ```
 
 ## Telemetry
-Chaperone is fully instrumented for OpenTelemetry traces & logs. Although disabled by default, instrumentation can enabled via the [standard OpenTelemetry environment variables](https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/#general-sdk-configuration).
+Chaperone is fully instrumented for OpenTelemetry traces & logs. Although disabled by default, instrumentation can enabled by setting `OTEL_ENABLED` to true and is configured via the [standard OpenTelemetry environment variables](https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/#general-sdk-configuration).
 
-Logs are always emmitted to stderr, in addition to 
+Logs are always emmitted to stderr, in addition to the optional OpenTelemetry exporter.

pkg/telemetry/log/logger.go

@@ -264,3 +264,8 @@ func (l *Logger) With(fields ...string) *Logger {
 		Writer:    l.Writer,
 	}
 }
+
+func (l *Logger) Output(calldepth int, s string) error {
+	l.Writer.Write([]byte(s))
+	return nil
+}

pkg/telemetry/mod.go

@@ -3,20 +3,37 @@ package telemetry
 import (
 	"context"
 
+	"github.com/KillianMeersman/chaperone/pkg/config"
 	"github.com/KillianMeersman/chaperone/pkg/telemetry/log"
 	"github.com/KillianMeersman/chaperone/pkg/telemetry/trace"
+	"github.com/go-logr/stdr"
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/sdk/resource"
 	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 const SERVICE_NAME = "chaperone"
 const SERVICE_VERSION = "0.0.3"
 
+type telemetryErrorHandler struct{}
+
+func (h *telemetryErrorHandler) Handle(err error) {
+	log.Error(context.Background(), err)
+}
+
 // Initialize telemetry components.
 // This includes tracing, logging, and metrics.
 // It is recommended to call this function at the start of your application.
 // The context should be cancelled when the application is shutting down to ensure proper cleanup.
 func InitTelemetry(ctx context.Context, name, version string) {
+	if !config.GetBool("OTEL_ENABLED", false, false) {
+		log.Info(ctx, "Telemetry is disabled")
+		return
+	}
+
+	otel.SetLogger(stdr.New(log.DefaultLogger))
+	otel.SetErrorHandler(&telemetryErrorHandler{})
+
 	resource := getResource(name, version)
 	log.Info(ctx, "Initializing telemetry", "name", name, "version", version)
 	log.Init(ctx, resource)