fix: Make service name configurable for Metrics and Tracing (#9563)

# Which Problems Are Solved

The service name is hardcoded in the metrics code. Making the service
name to be configurable helps when running multiple instances of
Zitadel.

The defaults remain unchanged, the service name will be defaulted to
ZITADEL.

# How the Problems Are Solved

Add a config option to override the name in defaults.yaml and pass it
down to the corresponding metrics or tracing module (google or otel)

# Additional Changes
NA

# Additional Context
NA

(cherry picked from commit dc64e35128)

cmd/defaults.yaml

@@ -14,6 +14,7 @@ Tracing:
   # for type 'otel' is used for standard [open telemetry](https://opentelemetry.io)
   # Fraction: 1.0
   # Endpoint: 'otel.collector.endpoint'
+  # ServiceName: 'ZITADEL' # Name of the service in traces
   #
   # type 'log' or '' disables tracing
   #
@@ -24,6 +25,8 @@ Tracing:
   Fraction: 1.0 # ZITADEL_TRACING_FRACTION
   # The endpoint of the otel collector endpoint
   Endpoint: "" #ZITADEL_TRACING_ENDPOINT
+  # The name of the service in traces
+  ServiceName: "ZITADEL" #ZITADEL_TRACING_SERVICENAME
 
 # Profiler enables capturing profiling data (CPU, Memory, ...) for performance analysis
 Profiler:

internal/telemetry/metrics/otel/open_telemetry.go

@@ -28,7 +28,7 @@ type Metrics struct {
 }
 
 func NewMetrics(meterName string) (metrics.Metrics, error) {
-	resource, err := otel_resource.ResourceWithService()
+	resource, err := otel_resource.ResourceWithService("ZITADEL")
 	if err != nil {
 		return nil, err
 	}

internal/telemetry/otel/resource.go

@@ -8,9 +8,9 @@ import (
 	"github.com/zitadel/zitadel/cmd/build"
 )
 
-func ResourceWithService() (*resource.Resource, error) {
+func ResourceWithService(serviceName string) (*resource.Resource, error) {
 	attributes := []attribute.KeyValue{
-		semconv.ServiceNameKey.String("ZITADEL"),
+		semconv.ServiceNameKey.String(serviceName),
 	}
 	if build.Version() != "" {
 		attributes = append(attributes, semconv.ServiceVersionKey.String(build.Version()))

internal/telemetry/tracing/google/google_tracer.go

@@ -9,13 +9,15 @@ import (
 )
 
 type Config struct {
-	ProjectID string
-	Fraction  float64
+	ProjectID   string
+	Fraction    float64
+	ServiceName string
 }
 
 func NewTracer(rawConfig map[string]interface{}) (err error) {
 	c := new(Config)
 	c.ProjectID, _ = rawConfig["projectid"].(string)
+	c.ServiceName, _ = rawConfig["servicename"].(string)
 	c.Fraction, err = otel.FractionFromConfig(rawConfig["fraction"])
 	if err != nil {
 		return err
@@ -34,6 +36,6 @@ func (c *Config) NewTracer() error {
 		return err
 	}
 
-	tracing.T, err = otel.NewTracer(sampler, exporter)
+	tracing.T, err = otel.NewTracer(sampler, exporter, c.ServiceName)
 	return err
 }

internal/telemetry/tracing/log/config.go

@@ -9,12 +9,14 @@ import (
 )
 
 type Config struct {
-	Fraction float64
+	Fraction    float64
+	ServiceName string
 }
 
 func NewTracer(rawConfig map[string]interface{}) (err error) {
 	c := new(Config)
 	c.Fraction, err = otel.FractionFromConfig(rawConfig["fraction"])
+	c.ServiceName, _ = rawConfig["servicename"].(string)
 	if err != nil {
 		return err
 	}
@@ -32,6 +34,6 @@ func (c *Config) NewTracer() error {
 		return err
 	}
 
-	tracing.T, err = otel.NewTracer(sampler, exporter)
+	tracing.T, err = otel.NewTracer(sampler, exporter, c.ServiceName)
 	return err
 }

internal/telemetry/tracing/otel/config.go

@@ -13,13 +13,15 @@ import (
 )
 
 type Config struct {
-	Fraction float64
-	Endpoint string
+	Fraction    float64
+	Endpoint    string
+	ServiceName string
 }
 
 func NewTracerFromConfig(rawConfig map[string]interface{}) (err error) {
 	c := new(Config)
 	c.Endpoint, _ = rawConfig["endpoint"].(string)
+	c.ServiceName, _ = rawConfig["servicename"].(string)
 	c.Fraction, err = FractionFromConfig(rawConfig["fraction"])
 	if err != nil {
 		return err
@@ -54,7 +56,7 @@ func (c *Config) NewTracer() error {
 		return err
 	}
 
-	tracing.T, err = NewTracer(sampler, exporter)
+	tracing.T, err = NewTracer(sampler, exporter, c.ServiceName)
 	return err
 }
 

internal/telemetry/tracing/otel/open_telemetry.go

@@ -18,8 +18,8 @@ type Tracer struct {
 	sampler  sdk_trace.Sampler
 }
 
-func NewTracer(sampler sdk_trace.Sampler, exporter sdk_trace.SpanExporter) (*Tracer, error) {
-	resource, err := otel_resource.ResourceWithService()
+func NewTracer(sampler sdk_trace.Sampler, exporter sdk_trace.SpanExporter, serviceName string) (*Tracer, error) {
+	resource, err := otel_resource.ResourceWithService(serviceName)
 	if err != nil {
 		return nil, err
 	}