vendor: update buildkit

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/README.md

@@ -12,8 +12,8 @@ go get -u go.opentelemetry.io/otel/exporters/otlp/otlptrace
 
 ## Examples
 
-- [Exporter setup and examples](./otlptracehttp/example_test.go)
-- [Full example sending telemetry to a local collector](../../../example/otel-collector)
+- [HTTP Exporter setup and examples](./otlptracehttp/example_test.go)
+- [Full example of gRPC Exporter sending telemetry to a local collector](../../../example/otel-collector)
 
 ## [`otlptrace`](https://pkg.go.dev/go.opentelemetry.io/otel/exporters/otlp/otlptrace)
 
@@ -38,12 +38,14 @@ override the default configuration. For more information about how each of
 these environment variables is interpreted, see [the OpenTelemetry
 specification](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.8.0/specification/protocol/exporter.md).
 
-| Environment variable                                                     | Option                        | Default value                       |
-| ------------------------------------------------------------------------ |------------------------------ | ----------------------------------- |
-| `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`       | `WithEndpoint` `WithInsecure` | `https://localhost:4317`            |
-| `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE` | `WithTLSClientConfig`         |                                     |
-| `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_TRACES_HEADERS`         | `WithHeaders`                 |                                     |
-| `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION` | `WithCompression`             |                                     |
-| `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT`         | `WithTimeout`                 | `10s`                               |
+| Environment variable                                                     | Option                        | Default value                                            |
+| ------------------------------------------------------------------------ |------------------------------ | -------------------------------------------------------- |
+| `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`       | `WithEndpoint` `WithInsecure` | `https://localhost:4317` or `https://localhost:4318`[^1] |
+| `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE` | `WithTLSClientConfig`         |                                                          |
+| `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_TRACES_HEADERS`         | `WithHeaders`                 |                                                          |
+| `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION` | `WithCompression`             |                                                          |
+| `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT`         | `WithTimeout`                 | `10s`                                                    |
+
+[^1]: The gRPC client defaults to `https://localhost:4317` and the HTTP client `https://localhost:4318`.
 
 Configuration using options have precedence over the environment variables.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/exporter.go

@@ -100,3 +100,14 @@ func NewUnstarted(client Client) *Exporter {
 		client: client,
 	}
 }
+
+// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+func (e *Exporter) MarshalLog() interface{} {
+	return struct {
+		Type   string
+		Client Client
+	}{
+		Type:   "otlptrace",
+		Client: e.client,
+	}
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig/envconfig.go

@@ -16,66 +16,59 @@ package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/
 
 import (
 	"crypto/tls"
-	"fmt"
-	"io/ioutil"
+	"crypto/x509"
 	"net/url"
 	"os"
 	"path"
-	"strconv"
 	"strings"
 	"time"
 
-	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/internal/envconfig"
 )
 
-var DefaultEnvOptionsReader = EnvOptionsReader{
-	GetEnv:   os.Getenv,
-	ReadFile: ioutil.ReadFile,
+// DefaultEnvOptionsReader is the default environments reader.
+var DefaultEnvOptionsReader = envconfig.EnvOptionsReader{
+	GetEnv:    os.Getenv,
+	ReadFile:  os.ReadFile,
+	Namespace: "OTEL_EXPORTER_OTLP",
 }
 
+// ApplyGRPCEnvConfigs applies the env configurations for gRPC.
 func ApplyGRPCEnvConfigs(cfg Config) Config {
-	return DefaultEnvOptionsReader.ApplyGRPCEnvConfigs(cfg)
-}
-
-func ApplyHTTPEnvConfigs(cfg Config) Config {
-	return DefaultEnvOptionsReader.ApplyHTTPEnvConfigs(cfg)
-}
-
-type EnvOptionsReader struct {
-	GetEnv   func(string) string
-	ReadFile func(filename string) ([]byte, error)
-}
-
-func (e *EnvOptionsReader) ApplyHTTPEnvConfigs(cfg Config) Config {
-	opts := e.GetOptionsFromEnv()
-	for _, opt := range opts {
-		cfg = opt.ApplyHTTPOption(cfg)
-	}
-	return cfg
-}
-
-func (e *EnvOptionsReader) ApplyGRPCEnvConfigs(cfg Config) Config {
-	opts := e.GetOptionsFromEnv()
+	opts := getOptionsFromEnv()
 	for _, opt := range opts {
 		cfg = opt.ApplyGRPCOption(cfg)
 	}
 	return cfg
 }
 
-func (e *EnvOptionsReader) GetOptionsFromEnv() []GenericOption {
-	var opts []GenericOption
+// ApplyHTTPEnvConfigs applies the env configurations for HTTP.
+func ApplyHTTPEnvConfigs(cfg Config) Config {
+	opts := getOptionsFromEnv()
+	for _, opt := range opts {
+		cfg = opt.ApplyHTTPOption(cfg)
+	}
+	return cfg
+}
 
-	// Endpoint
-	if v, ok := e.getEnvValue("TRACES_ENDPOINT"); ok {
-		u, err := url.Parse(v)
-		// Ignore invalid values.
-		if err == nil {
-			// This is used to set the scheme for OTLP/HTTP.
-			if insecureSchema(u.Scheme) {
-				opts = append(opts, WithInsecure())
-			} else {
-				opts = append(opts, WithSecure())
-			}
+func getOptionsFromEnv() []GenericOption {
+	opts := []GenericOption{}
+
+	tlsConf := &tls.Config{}
+	DefaultEnvOptionsReader.Apply(
+		envconfig.WithURL("ENDPOINT", func(u *url.URL) {
+			opts = append(opts, withEndpointScheme(u))
+			opts = append(opts, newSplitOption(func(cfg Config) Config {
+				cfg.Traces.Endpoint = u.Host
+				// For OTLP/HTTP endpoint URLs without a per-signal
+				// configuration, the passed endpoint is used as a base URL
+				// and the signals are sent to these paths relative to that.
+				cfg.Traces.URLPath = path.Join(u.Path, DefaultTracesPath)
+				return cfg
+			}, withEndpointForGRPC(u)))
+		}),
+		envconfig.WithURL("TRACES_ENDPOINT", func(u *url.URL) {
+			opts = append(opts, withEndpointScheme(u))
 			opts = append(opts, newSplitOption(func(cfg Config) Config {
 				cfg.Traces.Endpoint = u.Host
 				// For endpoint URLs for OTLP/HTTP per-signal variables, the
@@ -88,140 +81,70 @@ func (e *EnvOptionsReader) GetOptionsFromEnv() []GenericOption {
 				}
 				cfg.Traces.URLPath = path
 				return cfg
-			}, func(cfg Config) Config {
-				// For OTLP/gRPC endpoints, this is the target to which the
-				// exporter is going to send telemetry.
-				cfg.Traces.Endpoint = path.Join(u.Host, u.Path)
-				return cfg
-			}))
-		}
-	} else if v, ok = e.getEnvValue("ENDPOINT"); ok {
-		u, err := url.Parse(v)
-		// Ignore invalid values.
-		if err == nil {
-			// This is used to set the scheme for OTLP/HTTP.
-			if insecureSchema(u.Scheme) {
-				opts = append(opts, WithInsecure())
-			} else {
-				opts = append(opts, WithSecure())
-			}
-			opts = append(opts, newSplitOption(func(cfg Config) Config {
-				cfg.Traces.Endpoint = u.Host
-				// For OTLP/HTTP endpoint URLs without a per-signal
-				// configuration, the passed endpoint is used as a base URL
-				// and the signals are sent to these paths relative to that.
-				cfg.Traces.URLPath = path.Join(u.Path, DefaultTracesPath)
-				return cfg
-			}, func(cfg Config) Config {
-				// For OTLP/gRPC endpoints, this is the target to which the
-				// exporter is going to send telemetry.
-				cfg.Traces.Endpoint = path.Join(u.Host, u.Path)
-				return cfg
-			}))
-		}
-	}
-
-	// Certificate File
-	if path, ok := e.getEnvValue("CERTIFICATE"); ok {
-		if tls, err := e.readTLSConfig(path); err == nil {
-			opts = append(opts, WithTLSClientConfig(tls))
-		} else {
-			otel.Handle(fmt.Errorf("failed to configure otlp exporter certificate '%s': %w", path, err))
-		}
-	}
-	if path, ok := e.getEnvValue("TRACES_CERTIFICATE"); ok {
-		if tls, err := e.readTLSConfig(path); err == nil {
-			opts = append(opts, WithTLSClientConfig(tls))
-		} else {
-			otel.Handle(fmt.Errorf("failed to configure otlp traces exporter certificate '%s': %w", path, err))
-		}
-	}
-
-	// Headers
-	if h, ok := e.getEnvValue("HEADERS"); ok {
-		opts = append(opts, WithHeaders(stringToHeader(h)))
-	}
-	if h, ok := e.getEnvValue("TRACES_HEADERS"); ok {
-		opts = append(opts, WithHeaders(stringToHeader(h)))
-	}
-
-	// Compression
-	if c, ok := e.getEnvValue("COMPRESSION"); ok {
-		opts = append(opts, WithCompression(stringToCompression(c)))
-	}
-	if c, ok := e.getEnvValue("TRACES_COMPRESSION"); ok {
-		opts = append(opts, WithCompression(stringToCompression(c)))
-	}
-	// Timeout
-	if t, ok := e.getEnvValue("TIMEOUT"); ok {
-		if d, err := strconv.Atoi(t); err == nil {
-			opts = append(opts, WithTimeout(time.Duration(d)*time.Millisecond))
-		}
-	}
-	if t, ok := e.getEnvValue("TRACES_TIMEOUT"); ok {
-		if d, err := strconv.Atoi(t); err == nil {
-			opts = append(opts, WithTimeout(time.Duration(d)*time.Millisecond))
-		}
-	}
+			}, withEndpointForGRPC(u)))
+		}),
+		envconfig.WithCertPool("CERTIFICATE", func(p *x509.CertPool) { tlsConf.RootCAs = p }),
+		envconfig.WithCertPool("TRACES_CERTIFICATE", func(p *x509.CertPool) { tlsConf.RootCAs = p }),
+		envconfig.WithClientCert("CLIENT_CERTIFICATE", "CLIENT_KEY", func(c tls.Certificate) { tlsConf.Certificates = []tls.Certificate{c} }),
+		envconfig.WithClientCert("TRACES_CLIENT_CERTIFICATE", "TRACES_CLIENT_KEY", func(c tls.Certificate) { tlsConf.Certificates = []tls.Certificate{c} }),
+		withTLSConfig(tlsConf, func(c *tls.Config) { opts = append(opts, WithTLSClientConfig(c)) }),
+		envconfig.WithBool("INSECURE", func(b bool) { opts = append(opts, withInsecure(b)) }),
+		envconfig.WithBool("TRACES_INSECURE", func(b bool) { opts = append(opts, withInsecure(b)) }),
+		envconfig.WithHeaders("HEADERS", func(h map[string]string) { opts = append(opts, WithHeaders(h)) }),
+		envconfig.WithHeaders("TRACES_HEADERS", func(h map[string]string) { opts = append(opts, WithHeaders(h)) }),
+		WithEnvCompression("COMPRESSION", func(c Compression) { opts = append(opts, WithCompression(c)) }),
+		WithEnvCompression("TRACES_COMPRESSION", func(c Compression) { opts = append(opts, WithCompression(c)) }),
+		envconfig.WithDuration("TIMEOUT", func(d time.Duration) { opts = append(opts, WithTimeout(d)) }),
+		envconfig.WithDuration("TRACES_TIMEOUT", func(d time.Duration) { opts = append(opts, WithTimeout(d)) }),
+	)
 
 	return opts
 }
 
-func insecureSchema(schema string) bool {
-	switch strings.ToLower(schema) {
+func withEndpointScheme(u *url.URL) GenericOption {
+	switch strings.ToLower(u.Scheme) {
 	case "http", "unix":
-		return true
+		return WithInsecure()
 	default:
-		return false
+		return WithSecure()
 	}
 }
 
-// getEnvValue gets an OTLP environment variable value of the specified key using the GetEnv function.
-// This function already prepends the OTLP prefix to all key lookup.
-func (e *EnvOptionsReader) getEnvValue(key string) (string, bool) {
-	v := strings.TrimSpace(e.GetEnv(fmt.Sprintf("OTEL_EXPORTER_OTLP_%s", key)))
-	return v, v != ""
-}
-
-func (e *EnvOptionsReader) readTLSConfig(path string) (*tls.Config, error) {
-	b, err := e.ReadFile(path)
-	if err != nil {
-		return nil, err
+func withEndpointForGRPC(u *url.URL) func(cfg Config) Config {
+	return func(cfg Config) Config {
+		// For OTLP/gRPC endpoints, this is the target to which the
+		// exporter is going to send telemetry.
+		cfg.Traces.Endpoint = path.Join(u.Host, u.Path)
+		return cfg
 	}
-	return CreateTLSConfig(b)
 }
 
-func stringToCompression(value string) Compression {
-	switch value {
-	case "gzip":
-		return GzipCompression
-	}
+// WithEnvCompression retrieves the specified config and passes it to ConfigFn as a Compression.
+func WithEnvCompression(n string, fn func(Compression)) func(e *envconfig.EnvOptionsReader) {
+	return func(e *envconfig.EnvOptionsReader) {
+		if v, ok := e.GetEnvValue(n); ok {
+			cp := NoCompression
+			if v == "gzip" {
+				cp = GzipCompression
+			}
 
-	return NoCompression
-}
-
-func stringToHeader(value string) map[string]string {
-	headersPairs := strings.Split(value, ",")
-	headers := make(map[string]string)
-
-	for _, header := range headersPairs {
-		nameValue := strings.SplitN(header, "=", 2)
-		if len(nameValue) < 2 {
-			continue
+			fn(cp)
+		}
+	}
+}
+
+// revive:disable-next-line:flag-parameter
+func withInsecure(b bool) GenericOption {
+	if b {
+		return WithInsecure()
+	}
+	return WithSecure()
+}
+
+func withTLSConfig(c *tls.Config, fn func(*tls.Config)) func(e *envconfig.EnvOptionsReader) {
+	return func(e *envconfig.EnvOptionsReader) {
+		if c.RootCAs != nil || len(c.Certificates) > 0 {
+			fn(c)
 		}
-		name, err := url.QueryUnescape(nameValue[0])
-		if err != nil {
-			continue
-		}
-		trimmedName := strings.TrimSpace(name)
-		value, err := url.QueryUnescape(nameValue[1])
-		if err != nil {
-			continue
-		}
-		trimmedValue := strings.TrimSpace(value)
-
-		headers[trimmedName] = trimmedValue
 	}
-
-	return headers
 }

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig/options.go

@@ -25,6 +25,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding/gzip"
 
+	"go.opentelemetry.io/otel/exporters/otlp/internal"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
 )
 
@@ -65,24 +66,39 @@ type (
 	}
 )
 
-func NewDefaultConfig() Config {
-	c := Config{
+// NewHTTPConfig returns a new Config with all settings applied from opts and
+// any unset setting using the default HTTP config values.
+func NewHTTPConfig(opts ...HTTPOption) Config {
+	cfg := Config{
 		Traces: SignalConfig{
-			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorPort),
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorHTTPPort),
 			URLPath:     DefaultTracesPath,
 			Compression: NoCompression,
 			Timeout:     DefaultTimeout,
 		},
 		RetryConfig: retry.DefaultConfig,
 	}
-
-	return c
+	cfg = ApplyHTTPEnvConfigs(cfg)
+	for _, opt := range opts {
+		cfg = opt.ApplyHTTPOption(cfg)
+	}
+	cfg.Traces.URLPath = internal.CleanPath(cfg.Traces.URLPath, DefaultTracesPath)
+	return cfg
 }
 
 // NewGRPCConfig returns a new Config with all settings applied from opts and
 // any unset setting using the default gRPC config values.
 func NewGRPCConfig(opts ...GRPCOption) Config {
-	cfg := NewDefaultConfig()
+	cfg := Config{
+		Traces: SignalConfig{
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorGRPCPort),
+			URLPath:     DefaultTracesPath,
+			Compression: NoCompression,
+			Timeout:     DefaultTimeout,
+		},
+		RetryConfig: retry.DefaultConfig,
+		DialOptions: []grpc.DialOption{grpc.WithUserAgent(internal.GetUserAgentHeader())},
+	}
 	cfg = ApplyGRPCEnvConfigs(cfg)
 	for _, opt := range opts {
 		cfg = opt.ApplyGRPCOption(cfg)

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go

@@ -15,9 +15,10 @@
 package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
 
 const (
-	// DefaultCollectorPort is the port the Exporter will attempt connect to
-	// if no collector port is provided.
-	DefaultCollectorPort uint16 = 4317
+	// DefaultCollectorGRPCPort is the default gRPC port of the collector.
+	DefaultCollectorGRPCPort uint16 = 4317
+	// DefaultCollectorHTTPPort is the default HTTP port of the collector.
+	DefaultCollectorHTTPPort uint16 = 4318
 	// DefaultCollectorHost is the host address the Exporter will attempt
 	// connect to if no collector address is provided.
 	DefaultCollectorHost string = "localhost"
@@ -36,7 +37,7 @@ const (
 	GzipCompression
 )
 
-// Marshaler describes the kind of message format sent to the collector
+// Marshaler describes the kind of message format sent to the collector.
 type Marshaler int
 
 const (

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform/attribute.go

@@ -48,8 +48,8 @@ func Iterator(iter attribute.Iterator) []*commonpb.KeyValue {
 }
 
 // ResourceAttributes transforms a Resource OTLP key-values.
-func ResourceAttributes(resource *resource.Resource) []*commonpb.KeyValue {
-	return Iterator(resource.Iter())
+func ResourceAttributes(res *resource.Resource) []*commonpb.KeyValue {
+	return Iterator(res.Iter())
 }
 
 // KeyValue transforms an attribute KeyValue into an OTLP key-value.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform/instrumentation.go

@@ -19,11 +19,11 @@ import (
 	commonpb "go.opentelemetry.io/proto/otlp/common/v1"
 )
 
-func InstrumentationLibrary(il instrumentation.Library) *commonpb.InstrumentationLibrary {
-	if il == (instrumentation.Library{}) {
+func InstrumentationScope(il instrumentation.Scope) *commonpb.InstrumentationScope {
+	if il == (instrumentation.Scope{}) {
 		return nil
 	}
-	return &commonpb.InstrumentationLibrary{
+	return &commonpb.InstrumentationScope{
 		Name:    il.Name,
 		Version: il.Version,
 	}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform/span.go

@@ -23,10 +23,6 @@ import (
 	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
 )
 
-const (
-	maxEventsPerSpan = 128
-)
-
 // Spans transforms a slice of OpenTelemetry spans into a slice of OTLP
 // ResourceSpans.
 func Spans(sdl []tracesdk.ReadOnlySpan) []*tracepb.ResourceSpans {
@@ -36,11 +32,11 @@ func Spans(sdl []tracesdk.ReadOnlySpan) []*tracepb.ResourceSpans {
 
 	rsm := make(map[attribute.Distinct]*tracepb.ResourceSpans)
 
-	type ilsKey struct {
+	type key struct {
 		r  attribute.Distinct
-		il instrumentation.Library
+		is instrumentation.Scope
 	}
-	ilsm := make(map[ilsKey]*tracepb.InstrumentationLibrarySpans)
+	ssm := make(map[key]*tracepb.ScopeSpans)
 
 	var resources int
 	for _, sd := range sdl {
@@ -49,30 +45,30 @@ func Spans(sdl []tracesdk.ReadOnlySpan) []*tracepb.ResourceSpans {
 		}
 
 		rKey := sd.Resource().Equivalent()
-		iKey := ilsKey{
+		k := key{
 			r:  rKey,
-			il: sd.InstrumentationLibrary(),
+			is: sd.InstrumentationScope(),
 		}
-		ils, iOk := ilsm[iKey]
+		scopeSpan, iOk := ssm[k]
 		if !iOk {
-			// Either the resource or instrumentation library were unknown.
-			ils = &tracepb.InstrumentationLibrarySpans{
-				InstrumentationLibrary: InstrumentationLibrary(sd.InstrumentationLibrary()),
-				Spans:                  []*tracepb.Span{},
-				SchemaUrl:              sd.InstrumentationLibrary().SchemaURL,
+			// Either the resource or instrumentation scope were unknown.
+			scopeSpan = &tracepb.ScopeSpans{
+				Scope:     InstrumentationScope(sd.InstrumentationScope()),
+				Spans:     []*tracepb.Span{},
+				SchemaUrl: sd.InstrumentationScope().SchemaURL,
 			}
 		}
-		ils.Spans = append(ils.Spans, span(sd))
-		ilsm[iKey] = ils
+		scopeSpan.Spans = append(scopeSpan.Spans, span(sd))
+		ssm[k] = scopeSpan
 
 		rs, rOk := rsm[rKey]
 		if !rOk {
 			resources++
 			// The resource was unknown.
 			rs = &tracepb.ResourceSpans{
-				Resource:                    Resource(sd.Resource()),
-				InstrumentationLibrarySpans: []*tracepb.InstrumentationLibrarySpans{ils},
-				SchemaUrl:                   sd.Resource().SchemaURL(),
+				Resource:   Resource(sd.Resource()),
+				ScopeSpans: []*tracepb.ScopeSpans{scopeSpan},
+				SchemaUrl:  sd.Resource().SchemaURL(),
 			}
 			rsm[rKey] = rs
 			continue
@@ -82,9 +78,9 @@ func Spans(sdl []tracesdk.ReadOnlySpan) []*tracepb.ResourceSpans {
 		// library lookup was unknown because if so we need to add it to the
 		// ResourceSpans. Otherwise, the instrumentation library has already
 		// been seen and the append we did above will be included it in the
-		// InstrumentationLibrarySpans reference.
+		// ScopeSpans reference.
 		if !iOk {
-			rs.InstrumentationLibrarySpans = append(rs.InstrumentationLibrarySpans, ils)
+			rs.ScopeSpans = append(rs.ScopeSpans, scopeSpan)
 		}
 	}
 
@@ -162,9 +158,10 @@ func links(links []tracesdk.Link) []*tracepb.Span_Link {
 		sid := otLink.SpanContext.SpanID()
 
 		sl = append(sl, &tracepb.Span_Link{
-			TraceId:    tid[:],
-			SpanId:     sid[:],
-			Attributes: KeyValues(otLink.Attributes),
+			TraceId:                tid[:],
+			SpanId:                 sid[:],
+			Attributes:             KeyValues(otLink.Attributes),
+			DroppedAttributesCount: uint32(otLink.DroppedAttributeCount),
 		})
 	}
 	return sl
@@ -176,29 +173,16 @@ func spanEvents(es []tracesdk.Event) []*tracepb.Span_Event {
 		return nil
 	}
 
-	evCount := len(es)
-	if evCount > maxEventsPerSpan {
-		evCount = maxEventsPerSpan
-	}
-	events := make([]*tracepb.Span_Event, 0, evCount)
-	nEvents := 0
-
+	events := make([]*tracepb.Span_Event, len(es))
 	// Transform message events
-	for _, e := range es {
-		if nEvents >= maxEventsPerSpan {
-			break
+	for i := 0; i < len(es); i++ {
+		events[i] = &tracepb.Span_Event{
+			Name:                   es[i].Name,
+			TimeUnixNano:           uint64(es[i].Time.UnixNano()),
+			Attributes:             KeyValues(es[i].Attributes),
+			DroppedAttributesCount: uint32(es[i].DroppedAttributeCount),
 		}
-		nEvents++
-		events = append(events,
-			&tracepb.Span_Event{
-				Name:         e.Name,
-				TimeUnixNano: uint64(e.Time.UnixNano()),
-				Attributes:   KeyValues(e.Attributes),
-				// TODO (rghetia) : Add Drop Counts when supported.
-			},
-		)
 	}
-
 	return events
 }
 

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/client.go

@@ -26,6 +26,8 @@ import (
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/status"
 
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/internal"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
@@ -196,9 +198,17 @@ func (c *client) UploadTraces(ctx context.Context, protoSpans []*tracepb.Resourc
 	defer cancel()
 
 	return c.requestFunc(ctx, func(iCtx context.Context) error {
-		_, err := c.tsc.Export(iCtx, &coltracepb.ExportTraceServiceRequest{
+		resp, err := c.tsc.Export(iCtx, &coltracepb.ExportTraceServiceRequest{
 			ResourceSpans: protoSpans,
 		})
+		if resp != nil && resp.PartialSuccess != nil {
+			msg := resp.PartialSuccess.GetErrorMessage()
+			n := resp.PartialSuccess.GetRejectedSpans()
+			if n != 0 || msg != "" {
+				err := internal.TracePartialSuccessError(n, msg)
+				otel.Handle(err)
+			}
+		}
 		// nil is converted to OK.
 		if status.Code(err) == codes.OK {
 			// Success.
@@ -265,11 +275,22 @@ func retryable(err error) (bool, time.Duration) {
 
 // throttleDelay returns a duration to wait for if an explicit throttle time
 // is included in the response status.
-func throttleDelay(status *status.Status) time.Duration {
-	for _, detail := range status.Details() {
+func throttleDelay(s *status.Status) time.Duration {
+	for _, detail := range s.Details() {
 		if t, ok := detail.(*errdetails.RetryInfo); ok {
 			return t.RetryDelay.AsDuration()
 		}
 	}
 	return 0
 }
+
+// MarshalLog is the marshaling function used by the logging system to represent this Client.
+func (c *client) MarshalLog() interface{} {
+	return struct {
+		Type     string
+		Endpoint string
+	}{
+		Type:     "otlphttpgrpc",
+		Endpoint: c.endpoint,
+	}
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/options.go

@@ -84,8 +84,7 @@ func WithReconnectionPeriod(rp time.Duration) Option {
 }
 
 func compressorToCompression(compressor string) otlpconfig.Compression {
-	switch compressor {
-	case "gzip":
+	if compressor == "gzip" {
 		return otlpconfig.GzipCompression
 	}
 

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/client.go

@@ -20,18 +20,17 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
-	"path"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
 	"google.golang.org/protobuf/proto"
 
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/internal"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
@@ -43,7 +42,7 @@ const contentTypeProto = "application/x-protobuf"
 
 var gzPool = sync.Pool{
 	New: func() interface{} {
-		w := gzip.NewWriter(ioutil.Discard)
+		w := gzip.NewWriter(io.Discard)
 		return w
 	},
 }
@@ -79,26 +78,7 @@ var _ otlptrace.Client = (*client)(nil)
 
 // NewClient creates a new HTTP trace client.
 func NewClient(opts ...Option) otlptrace.Client {
-	cfg := otlpconfig.NewDefaultConfig()
-	cfg = otlpconfig.ApplyHTTPEnvConfigs(cfg)
-	for _, opt := range opts {
-		cfg = opt.applyHTTPOption(cfg)
-	}
-
-	for pathPtr, defaultPath := range map[*string]string{
-		&cfg.Traces.URLPath: otlpconfig.DefaultTracesPath,
-	} {
-		tmp := strings.TrimSpace(*pathPtr)
-		if tmp == "" {
-			tmp = defaultPath
-		} else {
-			tmp = path.Clean(tmp)
-			if !path.IsAbs(tmp) {
-				tmp = fmt.Sprintf("/%s", tmp)
-			}
-		}
-		*pathPtr = tmp
-	}
+	cfg := otlpconfig.NewHTTPConfig(asHTTPOptions(opts)...)
 
 	httpClient := &http.Client{
 		Transport: ourTransport,
@@ -121,7 +101,7 @@ func NewClient(opts ...Option) otlptrace.Client {
 	}
 }
 
-// Start does nothing in a HTTP client
+// Start does nothing in a HTTP client.
 func (d *client) Start(ctx context.Context) error {
 	// nothing to do
 	select {
@@ -176,28 +156,49 @@ func (d *client) UploadTraces(ctx context.Context, protoSpans []*tracepb.Resourc
 			return err
 		}
 
-		var rErr error
+		if resp != nil && resp.Body != nil {
+			defer func() {
+				if err := resp.Body.Close(); err != nil {
+					otel.Handle(err)
+				}
+			}()
+		}
+
 		switch resp.StatusCode {
 		case http.StatusOK:
 			// Success, do not retry.
-		case http.StatusTooManyRequests,
-			http.StatusServiceUnavailable:
-			// Retry-able failure.
-			rErr = newResponseError(resp.Header)
-
-			// Going to retry, drain the body to reuse the connection.
-			if _, err := io.Copy(ioutil.Discard, resp.Body); err != nil {
-				_ = resp.Body.Close()
+			// Read the partial success message, if any.
+			var respData bytes.Buffer
+			if _, err := io.Copy(&respData, resp.Body); err != nil {
 				return err
 			}
-		default:
-			rErr = fmt.Errorf("failed to send %s to %s: %s", d.name, request.URL, resp.Status)
-		}
 
-		if err := resp.Body.Close(); err != nil {
-			return err
+			if respData.Len() != 0 {
+				var respProto coltracepb.ExportTraceServiceResponse
+				if err := proto.Unmarshal(respData.Bytes(), &respProto); err != nil {
+					return err
+				}
+
+				if respProto.PartialSuccess != nil {
+					msg := respProto.PartialSuccess.GetErrorMessage()
+					n := respProto.PartialSuccess.GetRejectedSpans()
+					if n != 0 || msg != "" {
+						err := internal.TracePartialSuccessError(n, msg)
+						otel.Handle(err)
+					}
+				}
+			}
+			return nil
+
+		case http.StatusTooManyRequests, http.StatusServiceUnavailable:
+			// Retry-able failures.  Drain the body to reuse the connection.
+			if _, err := io.Copy(io.Discard, resp.Body); err != nil {
+				otel.Handle(err)
+			}
+			return newResponseError(resp.Header)
+		default:
+			return fmt.Errorf("failed to send %s to %s: %s", d.name, request.URL, resp.Status)
 		}
-		return rErr
 	})
 }
 
@@ -208,6 +209,8 @@ func (d *client) newRequest(body []byte) (request, error) {
 		return request{Request: r}, err
 	}
 
+	r.Header.Set("User-Agent", internal.GetUserAgentHeader())
+
 	for k, v := range d.cfg.Headers {
 		r.Header.Set(k, v)
 	}
@@ -243,10 +246,23 @@ func (d *client) newRequest(body []byte) (request, error) {
 	return req, nil
 }
 
+// MarshalLog is the marshaling function used by the logging system to represent this Client.
+func (d *client) MarshalLog() interface{} {
+	return struct {
+		Type     string
+		Endpoint string
+		Insecure bool
+	}{
+		Type:     "otlphttphttp",
+		Endpoint: d.cfg.Endpoint,
+		Insecure: d.cfg.Insecure,
+	}
+}
+
 // bodyReader returns a closure returning a new reader for buf.
 func bodyReader(buf []byte) func() io.ReadCloser {
 	return func() io.ReadCloser {
-		return ioutil.NopCloser(bytes.NewReader(buf))
+		return io.NopCloser(bytes.NewReader(buf))
 	}
 }
 

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/options.go

@@ -40,6 +40,14 @@ type Option interface {
 	applyHTTPOption(otlpconfig.Config) otlpconfig.Config
 }
 
+func asHTTPOptions(opts []Option) []otlpconfig.HTTPOption {
+	converted := make([]otlpconfig.HTTPOption, len(opts))
+	for i, o := range opts {
+		converted[i] = otlpconfig.NewHTTPOption(o.applyHTTPOption)
+	}
+	return converted
+}
+
 // RetryConfig defines configuration for retrying batches in case of export
 // failure using an exponential backoff.
 type RetryConfig retry.Config
@@ -55,7 +63,7 @@ func (w wrappedOption) applyHTTPOption(cfg otlpconfig.Config) otlpconfig.Config
 // WithEndpoint allows one to set the address of the collector
 // endpoint that the driver will use to send spans. If
 // unset, it will instead try to use
-// the default endpoint (localhost:4317). Note that the endpoint
+// the default endpoint (localhost:4318). Note that the endpoint
 // must not contain any URL path.
 func WithEndpoint(endpoint string) Option {
 	return wrappedOption{otlpconfig.WithEndpoint(endpoint)}