Allow passing in an OTel resource as an option to clue.NewConfig

clue/config.go

@@ -85,6 +85,10 @@
 	if err != nil {
 		return nil, err
 	}
+	res, err = resource.Merge(res, options.resource)
+	if err != nil {
+		return nil, err
+	}
 	var meterProvider metric.MeterProvider
 	if metricExporter == nil {
 		meterProvider = metricnoop.NewMeterProvider()

clue/options.go

@@ -6,6 +6,7 @@ import (
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/resource"
 )
 
 type (
@@ -24,6 +25,8 @@ type (
 		sampleSize int
 		// propagators is the trace propagators.
 		propagators propagation.TextMapPropagator
+		// resource is the resource containing any additional attributes.
+		resource *resource.Resource
 		// errorHandler is the error handler used by the otel package.
 		errorHandler otel.ErrorHandler
 	}
@@ -71,6 +74,13 @@ func WithPropagators(propagator propagation.TextMapPropagator) Option {
 	}
 }
 
+// WithResource sets the resource containing any additional attributes.
+func WithResource(res *resource.Resource) Option {
+	return func(opts *options) {
+		opts.resource = res
+	}
+}
+
 // WithErrorHandler sets the error handler used by the telemetry package.
 func WithErrorHandler(errorHandler otel.ErrorHandler) Option {
 	return func(opts *options) {

clue/options_test.go

@@ -5,7 +5,10 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/resource"
+
 	"goa.design/clue/log"
 )
 
@@ -39,6 +42,11 @@ func TestOptions(t *testing.T) {
 			option: WithPropagators(propagation.TraceContext{}),
 			want:   func(o *options) { o.propagators = propagation.TraceContext{} },
 		},
+		{
+			name:   "with resource",
+			option: WithResource(resource.NewSchemaless(attribute.String("key", "value"))),
+			want:   func(o *options) { o.resource = resource.NewSchemaless(attribute.String("key", "value")) },
+		},
 		{
 			name:   "with error handler",
 			option: WithErrorHandler(dummyErrorHandler{}),
@@ -59,6 +67,7 @@ func TestOptions(t *testing.T) {
 			assert.Equal(t, want.sampleSize, got.sampleSize)
 			assert.Equal(t, want.readerInterval, got.readerInterval)
 			assert.Equal(t, want.propagators, got.propagators)
+			assert.Equal(t, want.resource, got.resource)
 			assert.IsType(t, want.errorHandler, got.errorHandler)
 		})
 	}