all: add runtime-id to profiler and tracer global tags.

ddtrace/ext/tags.go

@@ -82,4 +82,7 @@ const (
 	// ManualDrop is a tag which specifies that the trace to which this span
 	// belongs to should be dropped when set to true.
 	ManualDrop = "manual.drop"
+
+	// RuntimeID is a tag that contains a unique id for this process.
+	RuntimeID = "runtime-id"
 )

ddtrace/tracer/option.go

@@ -138,6 +138,7 @@ func newConfig(opts ...StartOption) *config {
 	for _, fn := range opts {
 		fn(c)
 	}
+	WithGlobalTag(ext.RuntimeID, globalconfig.GetRuntimeID())(c)
 	if c.env == "" {
 		if v, ok := c.globalTags["env"]; ok {
 			if e, ok := v.(string); ok {

ddtrace/tracer/tracer_test.go

@@ -21,6 +21,7 @@ import (
 	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
 	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
 	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/internal"
+	"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
 	"gopkg.in/DataDog/dd-trace-go.v1/internal/log"
 
 	"github.com/stretchr/testify/assert"
@@ -190,6 +191,7 @@ func TestTracerStartSpan(t *testing.T) {
 		// A span is not measured unless made so specifically
 		_, ok := span.Meta[keyMeasured]
 		assert.False(ok)
+		assert.Equal(globalconfig.GetRuntimeID(), span.Meta[ext.RuntimeID])
 	})
 
 	t.Run("priority", func(t *testing.T) {

internal/globalconfig/globalconfig.go

@@ -10,16 +10,20 @@ package globalconfig
 import (
 	"math"
 	"sync"
+
+	"github.com/google/uuid"
 )
 
 var cfg = &config{
 	analyticsRate: math.NaN(),
+	runtimeID:     uuid.New().String(),
 }
 
 type config struct {
 	mu            sync.RWMutex
 	analyticsRate float64
 	serviceName   string
+	runtimeID     string
 }
 
 // AnalyticsRate returns the sampling rate at which events should be marked. It uses
@@ -51,3 +55,10 @@ func SetServiceName(name string) {
 	defer cfg.mu.Unlock()
 	cfg.serviceName = name
 }
+
+// GetRuntimeID returns this process's unique runtime id.
+func GetRuntimeID() string {
+	cfg.mu.RLock()
+	defer cfg.mu.RUnlock()
+	return cfg.runtimeID
+}

profiler/options.go

@@ -15,6 +15,7 @@ import (
 	"strings"
 	"time"
 
+	"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
 	"gopkg.in/DataDog/dd-trace-go.v1/internal/log"
 	"gopkg.in/DataDog/dd-trace-go.v1/internal/version"
 
@@ -131,6 +132,7 @@ func defaultConfig() *config {
 		"runtime_compiler:"+runtime.Compiler,
 		"runtime_arch:"+runtime.GOARCH,
 		"runtime_os:"+runtime.GOOS,
+		"runtime-id:"+globalconfig.GetRuntimeID(),
 	)(&c)
 	// not for public use
 	if v := os.Getenv("DD_PROFILING_URL"); v != "" {

profiler/options_test.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/DataDog/datadog-go/statsd"
 	"github.com/stretchr/testify/assert"
+	"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
 )
 
 func TestOptions(t *testing.T) {
@@ -242,6 +243,7 @@ func TestDefaultConfig(t *testing.T) {
 		assert.Equal(DefaultDuration, cfg.cpuDuration)
 		assert.Equal(DefaultMutexFraction, cfg.mutexFraction)
 		assert.Equal(DefaultBlockRate, cfg.blockRate)
+		assert.Contains(cfg.tags, "runtime-id:"+globalconfig.GetRuntimeID())
 	})
 }
 

profiler/upload_test.go

@@ -20,6 +20,7 @@ import (
 	"testing"
 	"time"
 
+	"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
 	"gopkg.in/DataDog/dd-trace-go.v1/internal/version"
 
 	"github.com/stretchr/testify/assert"
@@ -75,6 +76,7 @@ func TestTryUpload(t *testing.T) {
 		fmt.Sprintf("runtime_compiler:%s", runtime.Compiler),
 		fmt.Sprintf("runtime_arch:%s", runtime.GOARCH),
 		fmt.Sprintf("runtime_os:%s", runtime.GOOS),
+		fmt.Sprintf("runtime-id:%s", globalconfig.GetRuntimeID()),
 	}, tags)
 	for k, v := range map[string]string{
 		"format":   "pprof",