[#17] config: Add resource attributes

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

tracing/config.go

@@ -3,6 +3,7 @@ package tracing
 import (
 	"crypto/x509"
 	"fmt"
+	"maps"
 )
 
 // Exporter is type of tracing target.
@@ -33,6 +34,9 @@ type Config struct {
 	// Version is version of service instance.
 	// Optional.
 	Version string
+	// Attributes is KV list of attributes.
+	// Optional.
+	Attributes map[string]string
 }
 
 func (c *Config) validate() error {
@@ -81,5 +85,6 @@ func (c *Config) hasChange(other *Config) bool {
 func (c *Config) serviceInfoEqual(other *Config) bool {
 	return c.Service == other.Service &&
 		c.InstanceID == other.InstanceID &&
-		c.Version == other.Version
+		c.Version == other.Version &&
+		maps.Equal(c.Attributes, other.Attributes)
 }

tracing/setup.go

@@ -162,6 +162,9 @@ func newResource(cfg *Config) *resource.Resource {
 	if len(cfg.InstanceID) > 0 {
 		attrs = append(attrs, semconv.ServiceInstanceID(cfg.InstanceID))
 	}
+	for k, v := range cfg.Attributes {
+		attrs = append(attrs, attribute.String(k, v))
+	}
 	return resource.NewWithAttributes(
 		semconv.SchemaURL,
 		attrs...,