refactor: use promexporter ApplyGenericEnvVars for shared config

Author: d0ugal

go.mod

@@ -5,7 +5,7 @@ go 1.25
 toolchain go1.25.3
 
 require (
-	github.com/d0ugal/promexporter v1.9.0
+	github.com/d0ugal/promexporter v1.10.0
 	github.com/prometheus/client_golang v1.23.2
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
 	go.opentelemetry.io/otel v1.38.0

go.sum

@@ -12,8 +12,8 @@ github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UF
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cloudwego/base64x v0.1.6 h1:t11wG9AECkCDk5fMSoxmufanudBtJ+/HemLstXDLI2M=
 github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gEHfghB2IPU=
-github.com/d0ugal/promexporter v1.9.0 h1:QJMdv4yvxiFtWB6poGx2OCXfIscerXvtv4YiW3K18CY=
-github.com/d0ugal/promexporter v1.9.0/go.mod h1:432NOomztqyLDSFegVGKZshT521EI2L0POj0lrwYjig=
+github.com/d0ugal/promexporter v1.10.0 h1:WFZkEH3vNa7QHM/vUAvXSOIPBi/mBdUH8fwzkA8a83c=
+github.com/d0ugal/promexporter v1.10.0/go.mod h1:rs9hxA+4myUhhygHnu70IerD8p0Ym6UHPdAnk8n4+00=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

internal/config/config.go

@@ -114,22 +114,14 @@ func loadFromEnv() (*Config, error) {
 		baseConfig.Metrics.Collection.DefaultInterval = promexporter_config.Duration{Duration: time.Second * 30}
 	}
 
-	// Tracing configuration
-	if enabledStr := os.Getenv("TRACING_ENABLED"); enabledStr != "" {
-		enabled := enabledStr == "true"
-		baseConfig.Tracing.Enabled = &enabled
-	}
-
-	if serviceName := os.Getenv("TRACING_SERVICE_NAME"); serviceName != "" {
-		baseConfig.Tracing.ServiceName = serviceName
-	}
+	config.BaseConfig = *baseConfig
 
-	if endpoint := os.Getenv("TRACING_ENDPOINT"); endpoint != "" {
-		baseConfig.Tracing.Endpoint = endpoint
+	// Apply generic environment variables (TRACING_ENABLED, PROFILING_ENABLED, etc.)
+	// These are handled by promexporter and are shared across all exporters
+	if err := promexporter_config.ApplyGenericEnvVars(&config.BaseConfig); err != nil {
+		return nil, fmt.Errorf("failed to apply generic environment variables: %w", err)
 	}
 
-	config.BaseConfig = *baseConfig
-
 	// GitHub configuration
 	if token := os.Getenv("GHCR_EXPORTER_GITHUB_TOKEN"); token != "" {
 		config.GitHub.Token = promexporter_config.NewSensitiveString(token)