Add option for direct Beyla spanmetric generation

configs/offsets/http2/inspect.go

@@ -43,7 +43,8 @@ func main() {
 		Addr:    "0.0.0.0:8080",
 		Handler: handler,
 	}
-	http2.ConfigureServer(server, nil)
+	err := http2.ConfigureServer(server, nil)
+	checkErr(err, "configuring server")
 
 	roundTripExample()
 	fmt.Printf("Listening [0.0.0.0:8080]...\n")

configs/offsets/std_inspect.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"os"
 )
 
 // This program is used to generate an executable that can be inspected by the go-offsets-tracker tool
@@ -28,9 +29,15 @@ func regularGetRequest(ctx context.Context, url string) error {
 }
 
 func main() {
-	regularGetRequest(context.Background(), "http://localhost:8090/rolldice")
-	http.ListenAndServe(":9090", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+	err := regularGetRequest(context.Background(), "http://localhost:8090/rolldice")
+	if err != nil {
+		os.Exit(1)
+	}
+	err = http.ListenAndServe(":9090", http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
 		// this doesn't need to have any sense!
 		writer.WriteHeader(request.ProtoMajor)
 	}))
+	if err != nil {
+		os.Exit(1)
+	}
 }

docs/sources/configure/options.md

@@ -783,6 +783,9 @@ of Beyla: application-level metrics or network metrics.
 - If the list contains `application`, the Beyla OpenTelemetry exporter exports application-level metrics;
   but only if there is defined an OpenTelemetry endpoint, and Beyla was able to discover any
   process matching the entries in the `discovery` section.
+- If the list contains `application_span`, the Beyla OpenTelemetry exporter exports application-level trace span metrics;
+  but only if there is defined an OpenTelemetry endpoint, and Beyla was able to discover any
+  process matching the entries in the `discovery` section.
 - If the list contains `network`, the Beyla OpenTelemetry exporter exports network-level
   metrics; but only if there is defined an OpenTelemetry endpoint and the
   [network metrics are enabled]({{< relref "../network" >}}).

docs/sources/tutorial/resources/server.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"net/http"
+	"os"
 	"strconv"
 	"time"
 )
@@ -27,5 +28,8 @@ func handleRequest(rw http.ResponseWriter, req *http.Request) {
 }
 
 func main() {
-	http.ListenAndServe(":8080", http.HandlerFunc(handleRequest))
+	err := http.ListenAndServe(":8080", http.HandlerFunc(handleRequest))
+	if err != nil {
+		os.Exit(1)
+	}
 }

pkg/internal/export/otel/common.go

@@ -256,6 +256,12 @@ const (
 	ServerPortKey             = attribute.Key("server.port")
 	HTTPRequestBodySizeKey    = attribute.Key("http.request.body.size")
 	HTTPResponseBodySizeKey   = attribute.Key("http.response.body.size")
+	SpanKindKey               = attribute.Key("span.kind")
+	SpanNameKey               = attribute.Key("span.name")
+	StatusCodeKey             = attribute.Key("status.code")
+	SourceKey                 = attribute.Key("source")
+	ServiceKey                = attribute.Key("service")
+	InstanceKey               = attribute.Key("instance")
 )
 
 func HTTPRequestMethod(val string) attribute.KeyValue {
@@ -297,3 +303,27 @@ func HTTPRequestBodySize(val int) attribute.KeyValue {
 func HTTPResponseBodySize(val int) attribute.KeyValue {
 	return HTTPResponseBodySizeKey.Int(val)
 }
+
+func SpanKindMetric(val string) attribute.KeyValue {
+	return SpanKindKey.String(val)
+}
+
+func SpanNameMetric(val string) attribute.KeyValue {
+	return SpanNameKey.String(val)
+}
+
+func SourceMetric(val string) attribute.KeyValue {
+	return SourceKey.String(val)
+}
+
+func ServiceMetric(val string) attribute.KeyValue {
+	return ServiceKey.String(val)
+}
+
+func StatusCodeMetric(val int) attribute.KeyValue {
+	return StatusCodeKey.Int(val)
+}
+
+func ServiceInstanceMetric(val string) attribute.KeyValue {
+	return InstanceKey.String(val)
+}