build(deps): bump github.com/uber/jaeger-client-go

Bumps [github.com/uber/jaeger-client-go](https://github.com/uber/jaeger-client-go) from 2.20.1+incompatible to 2.22.1+incompatible.
- [Release notes](https://github.com/uber/jaeger-client-go/releases)
- [Changelog](https://github.com/jaegertracing/jaeger-client-go/blob/master/CHANGELOG.md)
- [Commits](https://github.com/uber/jaeger-client-go/compare/v2.20.1...v2.22.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Matthew Heon <mheon@redhat.com>

18 files changed, 522 insertions, 36 deletions

diff --git a/vendor/github.com/uber/jaeger-client-go/CHANGELOG.md b/vendor/github.com/uber/jaeger-client-go/CHANGELOG.md
index 5e7e9d5e5..818568b28 100644
--- a/vendor/github.com/uber/jaeger-client-go/CHANGELOG.md
+++ b/vendor/github.com/uber/jaeger-client-go/CHANGELOG.md
@@ -1,6 +1,34 @@
 Changes by Version
 ==================
 
+2.22.1 (2020-01-16)
+-------------------
+
+- Increase UDP batch overhead to account for data loss metrics ([#488](https://github.com/jaegertracing/jaeger-client-go/pull/488)) -- Yuri Shkuro
+
+
+2.22.0 (2020-01-15)
+-------------------
+
+- Report data loss stats to Jaeger backend ([#482](https://github.com/jaegertracing/jaeger-client-go/pull/482)) -- Yuri Shkuro
+- Add limit on log records per span ([#483](https://github.com/jaegertracing/jaeger-client-go/pull/483)) -- Sokolov Yura
+
+
+2.21.1 (2019-12-20)
+-------------------
+
+- Update version correctly.
+
+
+2.21.0 (2019-12-20)
+-------------------
+
+- Clarify reporting error logs ([#469](https://github.com/jaegertracing/jaeger-client-go/pull/469)) -- Yuri Shkuro
+- Do not strip leading zeros from trace IDs ([#472](https://github.com/jaegertracing/jaeger-client-go/pull/472)) -- Yuri Shkuro
+- Chore (docs): fixed a couple of typos ([#475](https://github.com/jaegertracing/jaeger-client-go/pull/475)) -- Marc Bramaud
+- Support custom HTTP headers when reporting spans over HTTP ([#479](https://github.com/jaegertracing/jaeger-client-go/pull/479)) -- Albert Teoh
+
+
 2.20.1 (2019-11-08)
 -------------------
 
diff --git a/vendor/github.com/uber/jaeger-client-go/Makefile b/vendor/github.com/uber/jaeger-client-go/Makefile
index 0cfe6a5f6..d5e962ccf 100644
--- a/vendor/github.com/uber/jaeger-client-go/Makefile
+++ b/vendor/github.com/uber/jaeger-client-go/Makefile
@@ -83,8 +83,12 @@ cover-html: cover
 test-examples:
 	make -C examples
 
+.PHONY: thrift
+thrift: idl-submodule thrift-compile
+
 # TODO at the moment we're not generating tchan_*.go files
-thrift: idl-submodule thrift-image
+.PHONY: thrift-compile
+thrift-compile: thrift-image
 	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/agent.thrift
 	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/sampling.thrift
 	$(THRIFT) -o /data --gen go:$(THRIFT_GO_ARGS) --out /data/$(THRIFT_GEN_DIR) /data/idl/thrift/jaeger.thrift
@@ -99,10 +103,12 @@ thrift: idl-submodule thrift-image
 	rm -rf crossdock/thrift/*/*-remote
 	rm -rf thrift-gen/jaeger/collector.go
 
+.PHONY: idl-submodule
 idl-submodule:
 	git submodule init
 	git submodule update
 
+.PHONY: thrift-image
 thrift-image:
 	$(THRIFT) -version
 
diff --git a/vendor/github.com/uber/jaeger-client-go/README.md b/vendor/github.com/uber/jaeger-client-go/README.md
index a3366114d..0e4d9fc0b 100644
--- a/vendor/github.com/uber/jaeger-client-go/README.md
+++ b/vendor/github.com/uber/jaeger-client-go/README.md
@@ -45,7 +45,7 @@ and [config/example_test.go](./config/example_test.go).
 ### Environment variables
 
 The tracer can be initialized with values coming from environment variables. None of the env vars are required
-and all of them can be overriden via direct setting of the property on the configuration object.
+and all of them can be overridden via direct setting of the property on the configuration object.
 
 Property| Description
 --- | ---
diff --git a/vendor/github.com/uber/jaeger-client-go/config/config.go b/vendor/github.com/uber/jaeger-client-go/config/config.go
index a0c32d804..44e93533c 100644
--- a/vendor/github.com/uber/jaeger-client-go/config/config.go
+++ b/vendor/github.com/uber/jaeger-client-go/config/config.go
@@ -134,6 +134,10 @@ type ReporterConfig struct {
 	// Password instructs reporter to include a password for basic http authentication when sending spans to
 	// jaeger-collector. Can be set by exporting an environment variable named JAEGER_PASSWORD
 	Password string `yaml:"password"`
+
+	// HTTPHeaders instructs the reporter to add these headers to the http request when reporting spans.
+	// This field takes effect only when using HTTPTransport by setting the CollectorEndpoint.
+	HTTPHeaders map[string]string `yaml:"http_headers"`
 }
 
 // BaggageRestrictionsConfig configures the baggage restrictions manager which can be used to whitelist
@@ -397,11 +401,12 @@ func (rc *ReporterConfig) NewReporter(
 
 func (rc *ReporterConfig) newTransport() (jaeger.Transport, error) {
 	switch {
-	case rc.CollectorEndpoint != "" && rc.User != "" && rc.Password != "":
-		return transport.NewHTTPTransport(rc.CollectorEndpoint, transport.HTTPBatchSize(1),
-			transport.HTTPBasicAuth(rc.User, rc.Password)), nil
 	case rc.CollectorEndpoint != "":
-		return transport.NewHTTPTransport(rc.CollectorEndpoint, transport.HTTPBatchSize(1)), nil
+		httpOptions := []transport.HTTPOption{transport.HTTPBatchSize(1), transport.HTTPHeaders(rc.HTTPHeaders)}
+		if rc.User != "" && rc.Password != "" {
+			httpOptions = append(httpOptions, transport.HTTPBasicAuth(rc.User, rc.Password))
+		}
+		return transport.NewHTTPTransport(rc.CollectorEndpoint, httpOptions...), nil
 	default:
 		return jaeger.NewUDPTransport(rc.LocalAgentHostPort, 0)
 	}
diff --git a/vendor/github.com/uber/jaeger-client-go/constants.go b/vendor/github.com/uber/jaeger-client-go/constants.go
index 5d27b628d..1702c7de4 100644
--- a/vendor/github.com/uber/jaeger-client-go/constants.go
+++ b/vendor/github.com/uber/jaeger-client-go/constants.go
@@ -22,7 +22,7 @@ import (
 
 const (
 	// JaegerClientVersion is the version of the client library reported as Span tag.
-	JaegerClientVersion = "Go-2.20.1"
+	JaegerClientVersion = "Go-2.22.1"
 
 	// JaegerClientVersionTagKey is the name of the tag used to report client version.
 	JaegerClientVersionTagKey = "jaeger.version"
diff --git a/vendor/github.com/uber/jaeger-client-go/internal/reporterstats/stats.go b/vendor/github.com/uber/jaeger-client-go/internal/reporterstats/stats.go
new file mode 100644
index 000000000..fe0bef268
--- /dev/null
+++ b/vendor/github.com/uber/jaeger-client-go/internal/reporterstats/stats.go
@@ -0,0 +1,25 @@
+// Copyright (c) 2020 The Jaeger Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package reporterstats
+
+// ReporterStats exposes some metrics from the RemoteReporter.
+type ReporterStats interface {
+	SpansDroppedFromQueue() int64
+}
+
+// Receiver can be implemented by a Transport to be given ReporterStats.
+type Receiver interface {
+	SetReporterStats(ReporterStats)
+}
diff --git a/vendor/github.com/uber/jaeger-client-go/jaeger_thrift_span.go b/vendor/github.com/uber/jaeger-client-go/jaeger_thrift_span.go
index f0f1afe2f..3ac2f8f94 100644
--- a/vendor/github.com/uber/jaeger-client-go/jaeger_thrift_span.go
+++ b/vendor/github.com/uber/jaeger-client-go/jaeger_thrift_span.go
@@ -24,6 +24,7 @@ import (
 )
 
 // BuildJaegerThrift builds jaeger span based on internal span.
+// TODO: (breaking change) move to internal package.
 func BuildJaegerThrift(span *Span) *j.Span {
 	span.Lock()
 	defer span.Unlock()
@@ -46,6 +47,7 @@ func BuildJaegerThrift(span *Span) *j.Span {
 }
 
 // BuildJaegerProcessThrift creates a thrift Process type.
+// TODO: (breaking change) move to internal package.
 func BuildJaegerProcessThrift(span *Span) *j.Process {
 	span.Lock()
 	defer span.Unlock()
diff --git a/vendor/github.com/uber/jaeger-client-go/reporter.go b/vendor/github.com/uber/jaeger-client-go/reporter.go
index 0b78cec20..830b5a4bb 100644
--- a/vendor/github.com/uber/jaeger-client-go/reporter.go
+++ b/vendor/github.com/uber/jaeger-client-go/reporter.go
@@ -22,6 +22,7 @@ import (
 
 	"github.com/opentracing/opentracing-go"
 
+	"github.com/uber/jaeger-client-go/internal/reporterstats"
 	"github.com/uber/jaeger-client-go/log"
 )
 
@@ -176,16 +177,31 @@ type reporterQueueItem struct {
 	close    *sync.WaitGroup
 }
 
+// reporterStats implements reporterstats.ReporterStats.
+type reporterStats struct {
+	droppedCount int64 // provided to Transports to report data loss to the backend
+}
+
+// SpansDroppedFromQueue implements reporterstats.ReporterStats.
+func (r *reporterStats) SpansDroppedFromQueue() int64 {
+	return atomic.LoadInt64(&r.droppedCount)
+}
+
+func (r *reporterStats) incDroppedCount() {
+	atomic.AddInt64(&r.droppedCount, 1)
+}
+
 type remoteReporter struct {
 	// These fields must be first in the struct because `sync/atomic` expects 64-bit alignment.
 	// Cf. https://github.com/uber/jaeger-client-go/issues/155, https://goo.gl/zW7dgq
-	queueLength int64
+	queueLength int64 // used to update metrics.Gauge
 	closed      int64 // 0 - not closed, 1 - closed
 
 	reporterOptions
 
-	sender Transport
-	queue  chan reporterQueueItem
+	sender        Transport
+	queue         chan reporterQueueItem
+	reporterStats *reporterStats
 }
 
 // NewRemoteReporter creates a new reporter that sends spans out of process by means of Sender.
@@ -213,6 +229,10 @@ func NewRemoteReporter(sender Transport, opts ...ReporterOption) Reporter {
 		reporterOptions: options,
 		sender:          sender,
 		queue:           make(chan reporterQueueItem, options.queueSize),
+		reporterStats:   new(reporterStats),
+	}
+	if receiver, ok := sender.(reporterstats.Receiver); ok {
+		receiver.SetReporterStats(reporter.reporterStats)
 	}
 	go reporter.processQueue()
 	return reporter
@@ -231,6 +251,7 @@ func (r *remoteReporter) Report(span *Span) {
 		atomic.AddInt64(&r.queueLength, 1)
 	default:
 		r.metrics.ReporterDropped.Inc(1)
+		r.reporterStats.incDroppedCount()
 	}
 }
 
@@ -241,7 +262,7 @@ func (r *remoteReporter) Close() {
 		return
 	}
 	r.sendCloseEvent()
-	r.sender.Close()
+	_ = r.sender.Close()
 }
 
 func (r *remoteReporter) sendCloseEvent() {
@@ -263,7 +284,7 @@ func (r *remoteReporter) processQueue() {
 	flush := func() {
 		if flushed, err := r.sender.Flush(); err != nil {
 			r.metrics.ReporterFailure.Inc(int64(flushed))
-			r.logger.Error(fmt.Sprintf("error when flushing the buffer: %s", err.Error()))
+			r.logger.Error(fmt.Sprintf("failed to flush Jaeger spans to server: %s", err.Error()))
 		} else if flushed > 0 {
 			r.metrics.ReporterSuccess.Inc(int64(flushed))
 		}
@@ -281,7 +302,7 @@ func (r *remoteReporter) processQueue() {
 				span := item.span
 				if flushed, err := r.sender.Append(span); err != nil {
 					r.metrics.ReporterFailure.Inc(int64(flushed))
-					r.logger.Error(fmt.Sprintf("error reporting span %q: %s", span.OperationName(), err.Error()))
+					r.logger.Error(fmt.Sprintf("error reporting Jaeger span %q: %s", span.OperationName(), err.Error()))
 				} else if flushed > 0 {
 					r.metrics.ReporterSuccess.Inc(int64(flushed))
 					// to reduce the number of gauge stats, we only emit queue length on flush
diff --git a/vendor/github.com/uber/jaeger-client-go/span.go b/vendor/github.com/uber/jaeger-client-go/span.go
index bbf6fb068..42c9112c0 100644
--- a/vendor/github.com/uber/jaeger-client-go/span.go
+++ b/vendor/github.com/uber/jaeger-client-go/span.go
@@ -59,6 +59,9 @@ type Span struct {
 	// The span's "micro-log"
 	logs []opentracing.LogRecord
 
+	// The number of logs dropped because of MaxLogsPerSpan.
+	numDroppedLogs int
+
 	// references for this span
 	references []Reference
 
@@ -152,7 +155,12 @@ func (s *Span) Logs() []opentracing.LogRecord {
 	s.Lock()
 	defer s.Unlock()
 
-	return append([]opentracing.LogRecord(nil), s.logs...)
+	logs := append([]opentracing.LogRecord(nil), s.logs...)
+	if s.numDroppedLogs != 0 {
+		fixLogs(logs, s.numDroppedLogs)
+	}
+
+	return logs
 }
 
 // References returns references for this span
@@ -234,8 +242,65 @@ func (s *Span) Log(ld opentracing.LogData) {
 
 // this function should only be called while holding a Write lock
 func (s *Span) appendLogNoLocking(lr opentracing.LogRecord) {
-	// TODO add logic to limit number of logs per span (issue #46)
-	s.logs = append(s.logs, lr)
+	maxLogs := s.tracer.options.maxLogsPerSpan
+	if maxLogs == 0 || len(s.logs) < maxLogs {
+		s.logs = append(s.logs, lr)
+		return
+	}
+
+	// We have too many logs. We don't touch the first numOld logs; we treat the
+	// rest as a circular buffer and overwrite the oldest log among those.
+	numOld := (maxLogs - 1) / 2
+	numNew := maxLogs - numOld
+	s.logs[numOld+s.numDroppedLogs%numNew] = lr
+	s.numDroppedLogs++
+}
+
+// rotateLogBuffer rotates the records in the buffer: records 0 to pos-1 move at
+// the end (i.e. pos circular left shifts).
+func rotateLogBuffer(buf []opentracing.LogRecord, pos int) {
+	// This algorithm is described in:
+	//    http://www.cplusplus.com/reference/algorithm/rotate
+	for first, middle, next := 0, pos, pos; first != middle; {
+		buf[first], buf[next] = buf[next], buf[first]
+		first++
+		next++
+		if next == len(buf) {
+			next = middle
+		} else if first == middle {
+			middle = next
+		}
+	}
+}
+
+func fixLogs(logs []opentracing.LogRecord, numDroppedLogs int) {
+	// We dropped some log events, which means that we used part of Logs as a
+	// circular buffer (see appendLog). De-circularize it.
+	numOld := (len(logs) - 1) / 2
+	numNew := len(logs) - numOld
+	rotateLogBuffer(logs[numOld:], numDroppedLogs%numNew)
+
+	// Replace the log in the middle (the oldest "new" log) with information
+	// about the dropped logs. This means that we are effectively dropping one
+	// more "new" log.
+	numDropped := numDroppedLogs + 1
+	logs[numOld] = opentracing.LogRecord{
+		// Keep the timestamp of the last dropped event.
+		Timestamp: logs[numOld].Timestamp,
+		Fields: []log.Field{
+			log.String("event", "dropped Span logs"),
+			log.Int("dropped_log_count", numDropped),
+			log.String("component", "jaeger-client"),
+		},
+	}
+}
+
+func (s *Span) fixLogsIfDropped() {
+	if s.numDroppedLogs == 0 {
+		return
+	}
+	fixLogs(s.logs, s.numDroppedLogs)
+	s.numDroppedLogs = 0
 }
 
 // SetBaggageItem implements SetBaggageItem() of opentracing.SpanContext
@@ -274,8 +339,9 @@ func (s *Span) FinishWithOptions(options opentracing.FinishOptions) {
 		s.applySamplingDecision(decision, true)
 	}
 	if s.context.IsSampled() {
+		s.Lock()
+		s.fixLogsIfDropped()
 		if len(options.LogRecords) > 0 || len(options.BulkLogData) > 0 {
-			s.Lock()
 			// Note: bulk logs are not subject to maxLogsPerSpan limit
 			if options.LogRecords != nil {
 				s.logs = append(s.logs, options.LogRecords...)
@@ -283,8 +349,8 @@ func (s *Span) FinishWithOptions(options opentracing.FinishOptions) {
 			for _, ld := range options.BulkLogData {
 				s.logs = append(s.logs, ld.ToLogRecord())
 			}
-			s.Unlock()
 		}
+		s.Unlock()
 	}
 	// call reportSpan even for non-sampled traces, to return span to the pool
 	// and update metrics counter
@@ -344,6 +410,7 @@ func (s *Span) reset() {
 	// Note: To reuse memory we can save the pointers on the heap
 	s.tags = s.tags[:0]
 	s.logs = s.logs[:0]
+	s.numDroppedLogs = 0
 	s.references = s.references[:0]
 }
 
diff --git a/vendor/github.com/uber/jaeger-client-go/span_context.go b/vendor/github.com/uber/jaeger-client-go/span_context.go
index b7230abfe..1b44f3f8c 100644
--- a/vendor/github.com/uber/jaeger-client-go/span_context.go
+++ b/vendor/github.com/uber/jaeger-client-go/span_context.go
@@ -213,9 +213,9 @@ func (c SpanContext) SetFirehose() {
 
 func (c SpanContext) String() string {
 	if c.traceID.High == 0 {
-		return fmt.Sprintf("%x:%x:%x:%x", c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.samplingState.stateFlags.Load())
+		return fmt.Sprintf("%016x:%016x:%016x:%x", c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.samplingState.stateFlags.Load())
 	}
-	return fmt.Sprintf("%x%016x:%x:%x:%x", c.traceID.High, c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.samplingState.stateFlags.Load())
+	return fmt.Sprintf("%016x%016x:%016x:%016x:%x", c.traceID.High, c.traceID.Low, uint64(c.spanID), uint64(c.parentID), c.samplingState.stateFlags.Load())
 }
 
 // ContextFromString reconstructs the Context encoded in a string
diff --git a/vendor/github.com/uber/jaeger-client-go/thrift-gen/jaeger/ttypes.go b/vendor/github.com/uber/jaeger-client-go/thrift-gen/jaeger/ttypes.go
index d23ed2fc2..e69c6d603 100644
--- a/vendor/github.com/uber/jaeger-client-go/thrift-gen/jaeger/ttypes.go
+++ b/vendor/github.com/uber/jaeger-client-go/thrift-gen/jaeger/ttypes.go
@@ -1577,11 +1577,192 @@ func (p *Process) String() string {
 }
 
 // Attributes:
+//  - FullQueueDroppedSpans
+//  - TooLargeDroppedSpans
+//  - FailedToEmitSpans
+type ClientStats struct {
+	FullQueueDroppedSpans int64 `thrift:"fullQueueDroppedSpans,1,required" json:"fullQueueDroppedSpans"`
+	TooLargeDroppedSpans  int64 `thrift:"tooLargeDroppedSpans,2,required" json:"tooLargeDroppedSpans"`
+	FailedToEmitSpans     int64 `thrift:"failedToEmitSpans,3,required" json:"failedToEmitSpans"`
+}
+
+func NewClientStats() *ClientStats {
+	return &ClientStats{}
+}
+
+func (p *ClientStats) GetFullQueueDroppedSpans() int64 {
+	return p.FullQueueDroppedSpans
+}
+
+func (p *ClientStats) GetTooLargeDroppedSpans() int64 {
+	return p.TooLargeDroppedSpans
+}
+
+func (p *ClientStats) GetFailedToEmitSpans() int64 {
+	return p.FailedToEmitSpans
+}
+func (p *ClientStats) Read(iprot thrift.TProtocol) error {
+	if _, err := iprot.ReadStructBegin(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
+	}
+
+	var issetFullQueueDroppedSpans bool = false
+	var issetTooLargeDroppedSpans bool = false
+	var issetFailedToEmitSpans bool = false
+
+	for {
+		_, fieldTypeId, fieldId, err := iprot.ReadFieldBegin()
+		if err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T field %d read error: ", p, fieldId), err)
+		}
+		if fieldTypeId == thrift.STOP {
+			break
+		}
+		switch fieldId {
+		case 1:
+			if err := p.readField1(iprot); err != nil {
+				return err
+			}
+			issetFullQueueDroppedSpans = true
+		case 2:
+			if err := p.readField2(iprot); err != nil {
+				return err
+			}
+			issetTooLargeDroppedSpans = true
+		case 3:
+			if err := p.readField3(iprot); err != nil {
+				return err
+			}
+			issetFailedToEmitSpans = true
+		default:
+			if err := iprot.Skip(fieldTypeId); err != nil {
+				return err
+			}
+		}
+		if err := iprot.ReadFieldEnd(); err != nil {
+			return err
+		}
+	}
+	if err := iprot.ReadStructEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T read struct end error: ", p), err)
+	}
+	if !issetFullQueueDroppedSpans {
+		return thrift.NewTProtocolExceptionWithType(thrift.INVALID_DATA, fmt.Errorf("Required field FullQueueDroppedSpans is not set"))
+	}
+	if !issetTooLargeDroppedSpans {
+		return thrift.NewTProtocolExceptionWithType(thrift.INVALID_DATA, fmt.Errorf("Required field TooLargeDroppedSpans is not set"))
+	}
+	if !issetFailedToEmitSpans {
+		return thrift.NewTProtocolExceptionWithType(thrift.INVALID_DATA, fmt.Errorf("Required field FailedToEmitSpans is not set"))
+	}
+	return nil
+}
+
+func (p *ClientStats) readField1(iprot thrift.TProtocol) error {
+	if v, err := iprot.ReadI64(); err != nil {
+		return thrift.PrependError("error reading field 1: ", err)
+	} else {
+		p.FullQueueDroppedSpans = v
+	}
+	return nil
+}
+
+func (p *ClientStats) readField2(iprot thrift.TProtocol) error {
+	if v, err := iprot.ReadI64(); err != nil {
+		return thrift.PrependError("error reading field 2: ", err)
+	} else {
+		p.TooLargeDroppedSpans = v
+	}
+	return nil
+}
+
+func (p *ClientStats) readField3(iprot thrift.TProtocol) error {
+	if v, err := iprot.ReadI64(); err != nil {
+		return thrift.PrependError("error reading field 3: ", err)
+	} else {
+		p.FailedToEmitSpans = v
+	}
+	return nil
+}
+
+func (p *ClientStats) Write(oprot thrift.TProtocol) error {
+	if err := oprot.WriteStructBegin("ClientStats"); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
+	}
+	if err := p.writeField1(oprot); err != nil {
+		return err
+	}
+	if err := p.writeField2(oprot); err != nil {
+		return err
+	}
+	if err := p.writeField3(oprot); err != nil {
+		return err
+	}
+	if err := oprot.WriteFieldStop(); err != nil {
+		return thrift.PrependError("write field stop error: ", err)
+	}
+	if err := oprot.WriteStructEnd(); err != nil {
+		return thrift.PrependError("write struct stop error: ", err)
+	}
+	return nil
+}
+
+func (p *ClientStats) writeField1(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("fullQueueDroppedSpans", thrift.I64, 1); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 1:fullQueueDroppedSpans: ", p), err)
+	}
+	if err := oprot.WriteI64(int64(p.FullQueueDroppedSpans)); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T.fullQueueDroppedSpans (1) field write error: ", p), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 1:fullQueueDroppedSpans: ", p), err)
+	}
+	return err
+}
+
+func (p *ClientStats) writeField2(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("tooLargeDroppedSpans", thrift.I64, 2); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 2:tooLargeDroppedSpans: ", p), err)
+	}
+	if err := oprot.WriteI64(int64(p.TooLargeDroppedSpans)); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T.tooLargeDroppedSpans (2) field write error: ", p), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 2:tooLargeDroppedSpans: ", p), err)
+	}
+	return err
+}
+
+func (p *ClientStats) writeField3(oprot thrift.TProtocol) (err error) {
+	if err := oprot.WriteFieldBegin("failedToEmitSpans", thrift.I64, 3); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field begin error 3:failedToEmitSpans: ", p), err)
+	}
+	if err := oprot.WriteI64(int64(p.FailedToEmitSpans)); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T.failedToEmitSpans (3) field write error: ", p), err)
+	}
+	if err := oprot.WriteFieldEnd(); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T write field end error 3:failedToEmitSpans: ", p), err)
+	}
+	return err
+}
+
+func (p *ClientStats) String() string {
+	if p == nil {
+		return "<nil>"
+	}
+	return fmt.Sprintf("ClientStats(%+v)", *p)
+}
+
+// Attributes:
 //  - Process
 //  - Spans
+//  - SeqNo
+//  - Stats
 type Batch struct {
-	Process *Process `thrift:"process,1,required" json:"process"`
-	Spans   []*Span  `thrift:"spans,2,required" json:"spans"`
+	Process *Process     `thrift:"process,1,required" json:"process"`
+	Spans   []*Span      `thrift:"spans,2,required" json:"spans"`
+	SeqNo   *int64       `thrift:"seqNo,3" json:"seqNo,omitempty"`
+	Stats   *ClientStats `thrift:"stats,4" json:"stats,omitempty"`
 }
 
 func NewBatch() *Batch {
@@ -1600,10 +1781,36 @@ func (p *Batch) GetProcess() *Process {
 func (p *Batch) GetSpans() []*Span {
 	return p.Spans
 }
+
+var Batch_SeqNo_DEFAULT int64
+
+func (p *Batch) GetSeqNo() int64 {
+	if !p.IsSetSeqNo() {
+		return Batch_SeqNo_DEFAULT
+	}
+	return *p.SeqNo
+}
+
+var Batch_Stats_DEFAULT *ClientStats
+
+func (p *Batch) GetStats() *ClientStats {
+	if !p.IsSetStats() {
+		return Batch_Stats_DEFAULT
+	}
+	return p.Stats
+}
 func (p *Batch) IsSetProcess() bool {
 	return p.Process != nil
 }
 
+func (p *Batch) IsSetSeqNo() bool {
+	return p.SeqNo != nil
+}
+
+func (p *Batch) IsSetStats() bool {
+	return p.Stats != nil
+}
+
 func (p *Batch) Read(iprot thrift.TProtocol) error {
 	if _, err := iprot.ReadStructBegin(); err != nil {
 		return thrift.PrependError(fmt.Sprintf("%T read error: ", p), err)
@@ -1631,6 +1838,14 @@ func (p *Batch) Read(iprot thrift.TProtocol) error {
 				return err
 			}
 			issetSpans = true
+		case 3:
+			if err := p.readField3(iprot); err != nil {
+				return err
+			}
+		case 4:
+			if err := p.readField4(iprot); err != nil {
+				return err
+			}
 		default:
 			if err := iprot.Skip(fieldTypeId); err != nil {
 				return err
@@ -1680,6 +1895,23 @@ func (p *Batch) readField2(iprot thrift.TProtocol) error {
 	return nil
 }
 
+func (p *Batch) readField3(iprot thrift.TProtocol) error {
+	if v, err := iprot.ReadI64(); err != nil {
+		return thrift.PrependError("error reading field 3: ", err)
+	} else {
+		p.SeqNo = &v
+	}
+	return nil
+}
+
+func (p *Batch) readField4(iprot thrift.TProtocol) error {
+	p.Stats = &ClientStats{}
+	if err := p.Stats.Read(iprot); err != nil {
+		return thrift.PrependError(fmt.Sprintf("%T error reading struct: ", p.Stats), err)
+	}
+	return nil
+}
+
 func (p *Batch) Write(oprot thrift.TProtocol) error {
 	if err := oprot.WriteStructBegin("Batch"); err != nil {
 		return thrift.PrependError(fmt.Sprintf("%T write struct begin error: ", p), err)
@@ -1690,6 +1922,12 @@ func (p *Batch) Write(oprot thrift.TProtocol) error {
 	if err := p.writeField2(oprot); err != nil {
 		return err
 	}
+	if err := p.writeField3(oprot); err != nil {
+		return err
+	}
+	if err := p.writeField4(oprot); err != nil {
+		return err
+	}
 	if err := oprot.WriteFieldStop(); err != nil {
 		return thrift.PrependError("write field stop error: ", err)
 	}
@@ -1733,6 +1971,36 @@ func (p *Batch) writeField2(oprot thrift.TProtocol) (err error) {
 	return err
 }
 
+func (p *Batch) writeField3(oprot thrift.TProtocol) (err error) {
+	if p.IsSetSeqNo() {
+		if err := oprot.WriteFieldBegin("seqNo", thrift.I64, 3); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field begin error 3:seqNo: ", p), err)
+		}
+		if err := oprot.WriteI64(int64(*p.SeqNo)); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T.seqNo (3) field write error: ", p), err)
+		}
+		if err := oprot.WriteFieldEnd(); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field end error 3:seqNo: ", p), err)
+		}
+	}
+	return err
+}
+
+func (p *Batch) writeField4(oprot thrift.TProtocol) (err error) {
+	if p.IsSetStats() {
+		if err := oprot.WriteFieldBegin("stats", thrift.STRUCT, 4); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field begin error 4:stats: ", p), err)
+		}
+		if err := p.Stats.Write(oprot); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T error writing struct: ", p.Stats), err)
+		}
+		if err := oprot.WriteFieldEnd(); err != nil {
+			return thrift.PrependError(fmt.Sprintf("%T write field end error 4:stats: ", p), err)
+		}
+	}
+	return err
+}
+
 func (p *Batch) String() string {
 	if p == nil {
 		return "<nil>"
diff --git a/vendor/github.com/uber/jaeger-client-go/thrift-gen/zipkincore/ttypes.go b/vendor/github.com/uber/jaeger-client-go/thrift-gen/zipkincore/ttypes.go
index 2d49e1d5f..15583e56b 100644
--- a/vendor/github.com/uber/jaeger-client-go/thrift-gen/zipkincore/ttypes.go
+++ b/vendor/github.com/uber/jaeger-client-go/thrift-gen/zipkincore/ttypes.go
@@ -729,7 +729,7 @@ func (p *BinaryAnnotation) String() string {
 // precise value possible. For example, gettimeofday or syncing nanoTime
 // against a tick of currentTimeMillis.
 //
-// For compatibilty with instrumentation that precede this field, collectors
+// For compatibility with instrumentation that precede this field, collectors
 // or span stores can derive this via Annotation.timestamp.
 // For example, SERVER_RECV.timestamp or CLIENT_SEND.timestamp.
 //
@@ -741,7 +741,7 @@ func (p *BinaryAnnotation) String() string {
 // precise measurement decoupled from problems of clocks, such as skew or NTP
 // updates causing time to move backwards.
 //
-// For compatibilty with instrumentation that precede this field, collectors
+// For compatibility with instrumentation that precede this field, collectors
 // or span stores can derive this by subtracting Annotation.timestamp.
 // For example, SERVER_SEND.timestamp - SERVER_RECV.timestamp.
 //
diff --git a/vendor/github.com/uber/jaeger-client-go/tracer.go b/vendor/github.com/uber/jaeger-client-go/tracer.go
index f03372dc7..da43ec6db 100644
--- a/vendor/github.com/uber/jaeger-client-go/tracer.go
+++ b/vendor/github.com/uber/jaeger-client-go/tracer.go
@@ -52,6 +52,7 @@ type Tracer struct {
 		highTraceIDGenerator        func() uint64 // custom high trace ID generator
 		maxTagValueLength           int
 		noDebugFlagOnForcedSampling bool
+		maxLogsPerSpan              int
 		// more options to come
 	}
 	// allocator of Span objects
diff --git a/vendor/github.com/uber/jaeger-client-go/tracer_options.go b/vendor/github.com/uber/jaeger-client-go/tracer_options.go
index 469685bb4..f016484b9 100644
--- a/vendor/github.com/uber/jaeger-client-go/tracer_options.go
+++ b/vendor/github.com/uber/jaeger-client-go/tracer_options.go
@@ -144,6 +144,18 @@ func (tracerOptions) MaxTagValueLength(maxTagValueLength int) TracerOption {
 	}
 }
 
+// MaxLogsPerSpan limits the number of Logs in a span (if set to a nonzero
+// value). If a span has more logs than this value, logs are dropped as
+// necessary (and replaced with a log describing how many were dropped).
+//
+// About half of the MaxLogsPerSpan logs kept are the oldest logs, and about
+// half are the newest logs.
+func (tracerOptions) MaxLogsPerSpan(maxLogsPerSpan int) TracerOption {
+	return func(tracer *Tracer) {
+		tracer.options.maxLogsPerSpan = maxLogsPerSpan
+	}
+}
+
 func (tracerOptions) ZipkinSharedRPCSpan(zipkinSharedRPCSpan bool) TracerOption {
 	return func(tracer *Tracer) {
 		tracer.options.zipkinSharedRPCSpan = zipkinSharedRPCSpan
diff --git a/vendor/github.com/uber/jaeger-client-go/transport/http.go b/vendor/github.com/uber/jaeger-client-go/transport/http.go
index bc1b3e6b0..bb7eb00c9 100644
--- a/vendor/github.com/uber/jaeger-client-go/transport/http.go
+++ b/vendor/github.com/uber/jaeger-client-go/transport/http.go
@@ -39,6 +39,7 @@ type HTTPTransport struct {
 	spans           []*j.Span
 	process         *j.Process
 	httpCredentials *HTTPBasicAuthCredentials
+	headers         map[string]string
 }
 
 // HTTPBasicAuthCredentials stores credentials for HTTP basic auth.
@@ -76,6 +77,13 @@ func HTTPRoundTripper(transport http.RoundTripper) HTTPOption {
 	}
 }
 
+// HTTPHeaders defines the HTTP headers that will be attached to the jaeger client's HTTP request
+func HTTPHeaders(headers map[string]string) HTTPOption {
+	return func(c *HTTPTransport) {
+		c.headers = headers
+	}
+}
+
 // NewHTTPTransport returns a new HTTP-backend transport. url should be an http
 // url of the collector to handle POST request, typically something like:
 //     http://hostname:14268/api/traces?format=jaeger.thrift
@@ -136,6 +144,9 @@ func (c *HTTPTransport) send(spans []*j.Span) error {
 		return err
 	}
 	req.Header.Set("Content-Type", "application/x-thrift")
+	for k, v := range c.headers {
+		req.Header.Set(k, v)
+	}
 
 	if c.httpCredentials != nil {
 		req.SetBasicAuth(c.httpCredentials.username, c.httpCredentials.password)
diff --git a/vendor/github.com/uber/jaeger-client-go/transport_udp.go b/vendor/github.com/uber/jaeger-client-go/transport_udp.go
index 7b9ccf937..7370d8007 100644
--- a/vendor/github.com/uber/jaeger-client-go/transport_udp.go
+++ b/vendor/github.com/uber/jaeger-client-go/transport_udp.go
@@ -18,8 +18,8 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/uber/jaeger-client-go/internal/reporterstats"
 	"github.com/uber/jaeger-client-go/thrift"
-
 	j "github.com/uber/jaeger-client-go/thrift-gen/jaeger"
 	"github.com/uber/jaeger-client-go/utils"
 )
@@ -27,12 +27,14 @@ import (
 // Empirically obtained constant for how many bytes in the message are used for envelope.
 // The total datagram size is:
 // sizeof(Span) * numSpans + processByteSize + emitBatchOverhead <= maxPacketSize
-// There is a unit test `TestEmitBatchOverhead` that validates this number.
+//
 // Note that due to the use of Compact Thrift protocol, overhead grows with the number of spans
 // in the batch, because the length of the list is encoded as varint32, as well as SeqId.
-const emitBatchOverhead = 30
+//
+// There is a unit test `TestEmitBatchOverhead` that validates this number, it fails at <68.
+const emitBatchOverhead = 70
 
-var errSpanTooLarge = errors.New("Span is too large")
+var errSpanTooLarge = errors.New("span is too large")
 
 type udpSender struct {
 	client          *utils.AgentClientUDP
@@ -44,9 +46,19 @@ type udpSender struct {
 	thriftProtocol  thrift.TProtocol
 	process         *j.Process
 	processByteSize int
+
+	// reporterStats provides access to stats that are only known to Reporter
+	reporterStats reporterstats.ReporterStats
+
+	// The following counters are always non-negative, but we need to send them in signed i64 Thrift fields,
+	// so we keep them as signed. At 10k QPS, overflow happens in about 300 million years.
+	batchSeqNo           int64
+	tooLargeDroppedSpans int64
+	failedToEmitSpans    int64
 }
 
-// NewUDPTransport creates a reporter that submits spans to jaeger-agent
+// NewUDPTransport creates a reporter that submits spans to jaeger-agent.
+// TODO: (breaking change) move to transport/ package.
 func NewUDPTransport(hostPort string, maxPacketSize int) (Transport, error) {
 	if len(hostPort) == 0 {
 		hostPort = fmt.Sprintf("%s:%d", DefaultUDPSpanServerHost, DefaultUDPSpanServerPort)
@@ -66,17 +78,22 @@ func NewUDPTransport(hostPort string, maxPacketSize int) (Transport, error) {
 		return nil, err
 	}
 
-	sender := &udpSender{
+	return &udpSender{
 		client:         client,
 		maxSpanBytes:   maxPacketSize - emitBatchOverhead,
 		thriftBuffer:   thriftBuffer,
-		thriftProtocol: thriftProtocol}
-	return sender, nil
+		thriftProtocol: thriftProtocol,
+	}, nil
+}
+
+// SetReporterStats implements reporterstats.Receiver.
+func (s *udpSender) SetReporterStats(rs reporterstats.ReporterStats) {
+	s.reporterStats = rs
 }
 
 func (s *udpSender) calcSizeOfSerializedThrift(thriftStruct thrift.TStruct) int {
 	s.thriftBuffer.Reset()
-	thriftStruct.Write(s.thriftProtocol)
+	_ = thriftStruct.Write(s.thriftProtocol)
 	return s.thriftBuffer.Len()
 }
 
@@ -89,6 +106,7 @@ func (s *udpSender) Append(span *Span) (int, error) {
 	jSpan := BuildJaegerThrift(span)
 	spanSize := s.calcSizeOfSerializedThrift(jSpan)
 	if spanSize > s.maxSpanBytes {
+		s.tooLargeDroppedSpans++
 		return 1, errSpanTooLarge
 	}
 
@@ -112,9 +130,18 @@ func (s *udpSender) Flush() (int, error) {
 	if n == 0 {
 		return 0, nil
 	}
-	err := s.client.EmitBatch(&j.Batch{Process: s.process, Spans: s.spanBuffer})
+	s.batchSeqNo++
+	batchSeqNo := int64(s.batchSeqNo)
+	err := s.client.EmitBatch(&j.Batch{
+		Process: s.process,
+		Spans:   s.spanBuffer,
+		SeqNo:   &batchSeqNo,
+		Stats:   s.makeStats(),
+	})
 	s.resetBuffers()
-
+	if err != nil {
+		s.failedToEmitSpans += int64(n)
+	}
 	return n, err
 }
 
@@ -129,3 +156,15 @@ func (s *udpSender) resetBuffers() {
 	s.spanBuffer = s.spanBuffer[:0]
 	s.byteBufferSize = s.processByteSize
 }
+
+func (s *udpSender) makeStats() *j.ClientStats {
+	var dropped int64
+	if s.reporterStats != nil {
+		dropped = s.reporterStats.SpansDroppedFromQueue()
+	}
+	return &j.ClientStats{
+		FullQueueDroppedSpans: dropped,
+		TooLargeDroppedSpans:  s.tooLargeDroppedSpans,
+		FailedToEmitSpans:     s.failedToEmitSpans,
+	}
+}
diff --git a/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go b/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go
index 6f042073d..fadd73e49 100644
--- a/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go
+++ b/vendor/github.com/uber/jaeger-client-go/utils/udp_client.go
@@ -85,7 +85,7 @@ func (a *AgentClientUDP) EmitBatch(batch *jaeger.Batch) error {
 		return err
 	}
 	if a.thriftBuffer.Len() > a.maxPacketSize {
-		return fmt.Errorf("Data does not fit within one UDP packet; size %d, max %d, spans %d",
+		return fmt.Errorf("data does not fit within one UDP packet; size %d, max %d, spans %d",
 			a.thriftBuffer.Len(), a.maxPacketSize, len(batch.Spans))
 	}
 	_, err := a.connUDP.Write(a.thriftBuffer.Bytes())
diff --git a/vendor/github.com/uber/jaeger-client-go/zipkin_thrift_span.go b/vendor/github.com/uber/jaeger-client-go/zipkin_thrift_span.go
index eb31c4369..73aeb000f 100644
--- a/vendor/github.com/uber/jaeger-client-go/zipkin_thrift_span.go
+++ b/vendor/github.com/uber/jaeger-client-go/zipkin_thrift_span.go
@@ -40,6 +40,7 @@ var specialTagHandlers = map[string]func(*zipkinSpan, interface{}){
 }
 
 // BuildZipkinThrift builds thrift span based on internal span.
+// TODO: (breaking change) move to transport/zipkin and make private.
 func BuildZipkinThrift(s *Span) *z.Span {
 	span := &zipkinSpan{Span: s}
 	span.handleSpecialTags()