add trace starts for each object type

internal/service/process_relationships.go

@@ -5,6 +5,8 @@ import (
 
 	"go.infratographer.com/x/events"
 	"go.infratographer.com/x/gidx"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 
 	"go.equinixmetal.net/infra9-metal-bridge/internal/permissions"
 )
@@ -13,6 +15,15 @@ import (
 // Relationship creations use events.
 // Relationship deletions use the api, as delete events delete all related resources and not just the provided ones.
 func (s *service) processRelationships(ctx context.Context, eventType string, relationships Relationships) int {
+	ctx, span := tracer.Start(ctx, "processRelationships",
+		trace.WithAttributes(
+			attribute.String("resource.id", relationships.Resource.PrefixedID().String()),
+			attribute.Int("resource.subject_relationships", len(relationships.SubjectRelationships)),
+		),
+	)
+
+	defer span.End()
+
 	rlogger := s.logger.With("resource.id", relationships.Resource.PrefixedID())
 
 	wantParentRelationship, wantSubjectRelationships := s.mapRelationWants(relationships)