"http": {
      "name": "envoy.tracers.lightstep",
      "typed_config": {
        "@type": "type.googleapis.com/envoy.config.trace.v3.LightstepConfig",
        "collector_cluster": "lightstep",
        "access_token_file": "{{ .lightstepToken}}"
      }
    }
  }
  {{- else if .datadog }}
  ,
  "tracing": {
    "http": {
      "name": "envoy.tracers.datadog",
      "typed_config": {

	"istio.io/istio/pkg/log"
	"istio.io/istio/pkg/wellknown"
)

const (
	envoyDatadog       = "envoy.tracers.datadog"
	envoyOpenTelemetry = "envoy.tracers.opentelemetry"
	envoySkywalking    = "envoy.tracers.skywalking"
	envoyZipkin        = "envoy.tracers.zipkin"
)

// this is used for testing. it should not be changed in regular code.
var clusterLookupFn = model.LookupCluster

			CurvePreferences: fips.TLSCurveIDs(),
		},
		// Record incoming and outgoing bytes.
		Incoming: globalConnStats.incInternodeInputBytes,
		Outgoing: globalConnStats.incInternodeOutputBytes,
		TraceTo:  globalTrace,
	})
	if err != nil {
		return err
	}
	globalGrid.Store(g)
	return nil

		{"meshConfig.defaultConfig.tracing.stackdriver.debug", "Istio supported tracers", false},
		{"meshConfig.defaultConfig.tracing.stackdriver.maxNumberOfAttributes", "Istio supported tracers", 0},
		{"meshConfig.defaultConfig.tracing.stackdriver.maxNumberOfAnnotations", "Istio supported tracers", 0},
		{"meshConfig.defaultConfig.tracing.stackdriver.maxNumberOfMessageEvents", "Istio supported tracers", 0},
	}

	for _, d := range warningSettings {

  Output enter_0 =
      ops::internal::Enter(root.WithOpName("enter_0"), a, "frame_0");
  Output exit_0 = ops::internal::Exit(root.WithOpName("exit_0"), enter_0);

  Output add = ops::Add(root.WithOpName("add"), exit_0, exit_0);

  Output enter_1 =
      ops::internal::Enter(root.WithOpName("enter_1"), add, "frame_0");
  Output exit_1 = ops::internal::Exit(root.WithOpName("exit_1"), enter_1);

	}
	return madmin.TraceInfo{
		TraceType: madmin.TraceOS,
		Time:      startTime,
		NodeName:  globalLocalNodeName,
		FuncName:  "os." + s.String(),
		Duration:  duration,
		Path:      path,
		Error:     errStr,
	}
}

func updateOSMetrics(s osMetric, paths ...string) func(err error) {
	if globalTrace.NumSubscribers(madmin.TraceOS) == 0 {
		osAction := globalOSMetrics.time(s)

func (u *unifier) nify(x, y Type, mode unifyMode, p *ifacePair) (result bool) {
	u.depth++
	if traceInference {
		u.tracef("%s ≡ %s\t// %s", x, y, mode)
	}
	defer func() {
		if traceInference && !result {
			u.tracef("%s ≢ %s", x, y)
		}
		u.depth--
	}()

	// nothing to do if x == y
	if x == y || Unalias(x) == Unalias(y) {
		return true
	}

		print("runtime: goid=", goid, "\n")
		throw("attempted to trace a bad status for a goroutine")
	}

	// Trace the status.
	if stackID == 0 {
		w = w.event(traceEvGoStatus, traceArg(goid), traceArg(uint64(mid)), traceArg(status))
	} else {
		w = w.event(traceEvGoStatusStack, traceArg(goid), traceArg(uint64(mid)), traceArg(status), traceArg(stackID))
	}

	// Trace any special ranges that are in-progress.
	if markAssist {

	tracingcfg "github.com/envoyproxy/go-control-plane/envoy/config/trace/v3"
	hcm "github.com/envoyproxy/go-control-plane/envoy/extensions/filters/network/http_connection_manager/v3"
	resourcedetectors "github.com/envoyproxy/go-control-plane/envoy/extensions/tracers/opentelemetry/resource_detectors/v3"
	otelsamplers "github.com/envoyproxy/go-control-plane/envoy/extensions/tracers/opentelemetry/samplers/v3"

package runtime

// traceExpWriter is a wrapper around trace writer that produces traceEvExperimentalBatch
// batches. This means that the data written to the writer need not conform to the standard
// trace format.
type traceExpWriter struct {
	traceWriter
	exp traceExperiment
}

// unsafeTraceExpWriter produces a traceExpWriter that doesn't lock the trace.
//
// It should only be used in contexts where either: