Try adding more OTel instrumentation

I have no idea what this will do or whether it will work at all.

Author: featherbread

cmd/randomizer-lambda/main.go

@@ -24,6 +24,7 @@ import (
 	lambdadetector "go.opentelemetry.io/contrib/detectors/aws/lambda"
 	"go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda"
 	"go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda/xrayconfig"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 	xraypropagator "go.opentelemetry.io/contrib/propagators/aws/xray"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
@@ -70,8 +71,9 @@ func main() {
 		StoreFactory:  storeFactory,
 		Logger:        logger,
 	}
-	appHandler := httpadapter.NewV2(app).ProxyWithContext
-	handler := otellambda.InstrumentHandler(appHandler, xrayconfig.WithRecommendedOptions(tp)...)
+	appHandler := otelhttp.NewHandler(app, "slack")
+	adapterHandler := httpadapter.NewV2(appHandler).ProxyWithContext
+	handler := otellambda.InstrumentHandler(adapterHandler, xrayconfig.WithRecommendedOptions(tp)...)
 	lambda.Start(handler)
 }
 

go.mod

@@ -19,6 +19,7 @@ require (
 	go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda v0.64.0
 	go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda/xrayconfig v0.64.0
 	go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws v0.64.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0
 	go.opentelemetry.io/contrib/propagators/aws v1.39.0
 	go.opentelemetry.io/otel v1.39.0
 	go.opentelemetry.io/otel/sdk v1.39.0
@@ -62,7 +63,6 @@ require (
 	github.com/spf13/pflag v1.0.9 // indirect
 	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.64.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.64.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.39.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.39.0 // indirect
 	go.opentelemetry.io/otel/metric v1.39.0 // indirect

internal/awsconfig/awsconfig.go

@@ -16,8 +16,11 @@ import (
 	"github.com/aws/aws-sdk-go-v2/aws/retry"
 	"github.com/aws/aws-sdk-go-v2/config"
 	"go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws"
+	"go.opentelemetry.io/otel"
 )
 
+var tracer = otel.Tracer("github.com/featherbread/randomizer/internal/awsconfig")
+
 const (
 	// DefaultTimeout is set to half of the 3-second response time limit that
 	// Slack imposes on slash commands.
@@ -40,7 +43,11 @@ func New(ctx context.Context) (aws.Config, error) {
 	// start latency (see [getEmbeddedCertTransport]). It can be enabled for
 	// standard server deployments if desired, but is far less beneficial.
 	if os.Getenv("AWS_CLIENT_EMBEDDED_TLS_ROOTS") == "1" {
-		transport = getEmbeddedCertTransport()
+		func() {
+			_, span := tracer.Start(ctx, "loadcerts")
+			defer span.End()
+			transport = getEmbeddedCertTransport()
+		}()
 	}
 
 	cfg, err := config.LoadDefaultConfig(ctx,