Merge pull request #6889 from a-robinson/prom

Godeps/Godeps.json

@@ -317,8 +317,8 @@
 			"Rev": "05017fcccf23c823bfdea560dcc958a136e54fb7"
 		},
 		{
-			"ImportPath": "github.com/matttproud/golang_protobuf_extensions/ext",
-			"Rev": "ba7d65ac66e9da93a714ca18f6d1bc7a0c09100c"
+			"ImportPath": "github.com/matttproud/golang_protobuf_extensions/pbutil",
+			"Rev": "fc2b8d3a73c4867e51861bbdd5ae3c1f0869dd6a"
 		},
 		{
 			"ImportPath": "github.com/miekg/dns",
@@ -348,18 +348,18 @@
 		},
 		{
 			"ImportPath": "github.com/prometheus/client_golang/model",
-			"Comment": "0.2.0-5-gde5f7a2",
-			"Rev": "de5f7a2db9d883392ce3ad667087280fe1ff9cea"
+			"Comment": "0.4.0-1-g692492e",
+			"Rev": "692492e54b553a81013254cc1fba4b6dd76fad30"
 		},
 		{
 			"ImportPath": "github.com/prometheus/client_golang/prometheus",
-			"Comment": "0.2.0-5-gde5f7a2",
-			"Rev": "de5f7a2db9d883392ce3ad667087280fe1ff9cea"
+			"Comment": "0.4.0-1-g692492e",
+			"Rev": "692492e54b553a81013254cc1fba4b6dd76fad30"
 		},
 		{
 			"ImportPath": "github.com/prometheus/client_golang/text",
-			"Comment": "0.2.0-5-gde5f7a2",
-			"Rev": "de5f7a2db9d883392ce3ad667087280fe1ff9cea"
+			"Comment": "0.4.0-1-g692492e",
+			"Rev": "692492e54b553a81013254cc1fba4b6dd76fad30"
 		},
 		{
 			"ImportPath": "github.com/prometheus/client_model/go",
@@ -368,7 +368,7 @@
 		},
 		{
 			"ImportPath": "github.com/prometheus/procfs",
-			"Rev": "6c34ef819e19b4e16f410100ace4aa006f0e3bf8"
+			"Rev": "490cc6eb5fa45bf8a8b7b73c8bc82a8160e8531d"
 		},
 		{
 			"ImportPath": "github.com/rackspace/gophercloud",

Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/ext/all_test.go → Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil/all_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package ext
+package pbutil
 
 import (
 	"bytes"
@@ -21,6 +21,8 @@ import (
 	"testing"
 	"testing/quick"
 
+	"github.com/matttproud/golang_protobuf_extensions/pbtest"
+
 	. "github.com/golang/protobuf/proto"
 	. "github.com/golang/protobuf/proto/testdata"
 )
@@ -138,10 +140,10 @@ I expect it may.  Let's hope you enjoy testing as much as we do.`),
 
 func TestEndToEndValid(t *testing.T) {
 	for _, test := range [][]Message{
-		[]Message{&Empty{}},
-		[]Message{&GoEnum{Foo: FOO_FOO1.Enum()}, &Empty{}, &GoEnum{Foo: FOO_FOO1.Enum()}},
-		[]Message{&GoEnum{Foo: FOO_FOO1.Enum()}},
-		[]Message{&Strings{
+		{&Empty{}},
+		{&GoEnum{Foo: FOO_FOO1.Enum()}, &Empty{}, &GoEnum{Foo: FOO_FOO1.Enum()}},
+		{&GoEnum{Foo: FOO_FOO1.Enum()}},
+		{&Strings{
 			StringField: String(`This is my gigantic, unhappy string.  It exceeds
 the encoding size of a single byte varint.  We are using it to fuzz test the
 correctness of the header decoding mechanisms, which may prove problematic.
@@ -176,45 +178,6 @@ I expect it may.  Let's hope you enjoy testing as much as we do.`),
 	}
 }
 
-// visitMessage empties the private state fields of the quick.Value()-generated
-// Protocol Buffer messages, for they cause an inordinate amount of problems.
-// This is because we are using an automated fuzz generator on a type with
-// private fields.
-func visitMessage(m Message) {
-	t := reflect.TypeOf(m)
-	if t.Kind() != reflect.Ptr {
-		return
-	}
-	derefed := t.Elem()
-	if derefed.Kind() != reflect.Struct {
-		return
-	}
-	v := reflect.ValueOf(m)
-	elem := v.Elem()
-	for i := 0; i < elem.NumField(); i++ {
-		field := elem.FieldByIndex([]int{i})
-		fieldType := field.Type()
-		if fieldType.Implements(reflect.TypeOf((*Message)(nil)).Elem()) {
-			visitMessage(field.Interface().(Message))
-		}
-		if field.Kind() == reflect.Slice {
-			for i := 0; i < field.Len(); i++ {
-				elem := field.Index(i)
-				elemType := elem.Type()
-				if elemType.Implements(reflect.TypeOf((*Message)(nil)).Elem()) {
-					visitMessage(elem.Interface().(Message))
-				}
-			}
-		}
-	}
-	if field := elem.FieldByName("XXX_unrecognized"); field.IsValid() {
-		field.Set(reflect.ValueOf([]byte{}))
-	}
-	if field := elem.FieldByName("XXX_extensions"); field.IsValid() {
-		field.Set(reflect.ValueOf(nil))
-	}
-}
-
 // rndMessage generates a random valid Protocol Buffer message.
 func rndMessage(r *rand.Rand) Message {
 	var t reflect.Type
@@ -307,7 +270,9 @@ func rndMessage(r *rand.Rand) Message {
 	if !ok {
 		panic("attempt to generate illegal item; consult item 11")
 	}
-	visitMessage(v.Interface().(Message))
+	if err := pbtest.SanitizeGenerated(v.Interface().(Message)); err != nil {
+		panic(err)
+	}
 	return v.Interface().(Message)
 }
 

Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/ext/decode.go → Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil/decode.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package ext
+package pbutil
 
 import (
 	"encoding/binary"

Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/ext/doc.go → Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil/doc.go

@@ -12,5 +12,5 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package ext enables record length-delimited Protocol Buffer streaming.
-package ext
+// Package pbutil provides record length-delimited Protocol Buffer streaming.
+package pbutil

Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/ext/encode.go → Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil/encode.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package ext
+package pbutil
 
 import (
 	"encoding/binary"

Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/ext/fixtures_test.go → Godeps/_workspace/src/github.com/matttproud/golang_protobuf_extensions/pbutil/fixtures_test.go

@@ -27,7 +27,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-package ext
+package pbutil
 
 import (
 	. "github.com/golang/protobuf/proto"

Godeps/_workspace/src/github.com/prometheus/client_golang/model/metric.go

@@ -14,10 +14,8 @@
 package model
 
 import (
-	"encoding/binary"
 	"encoding/json"
 	"fmt"
-	"hash/fnv"
 	"sort"
 	"strings"
 )
@@ -66,37 +64,7 @@ func (m Metric) String() string {
 
 // Fingerprint returns a Metric's Fingerprint.
 func (m Metric) Fingerprint() Fingerprint {
-	labelNames := make([]string, 0, len(m))
-	maxLength := 0
-
-	for labelName, labelValue := range m {
-		labelNames = append(labelNames, string(labelName))
-		if len(labelName) > maxLength {
-			maxLength = len(labelName)
-		}
-		if len(labelValue) > maxLength {
-			maxLength = len(labelValue)
-		}
-	}
-
-	sort.Strings(labelNames)
-
-	summer := fnv.New64a()
-	buf := make([]byte, maxLength)
-
-	for _, labelName := range labelNames {
-		labelValue := m[LabelName(labelName)]
-
-		copy(buf, labelName)
-		summer.Write(buf[:len(labelName)])
-
-		summer.Write(separator)
-
-		copy(buf, labelValue)
-		summer.Write(buf[:len(labelValue)])
-	}
-
-	return Fingerprint(binary.LittleEndian.Uint64(summer.Sum(nil)))
+	return metricToFingerprint(m)
 }
 
 // Clone returns a copy of the Metric.
@@ -133,7 +101,7 @@ type COWMetric struct {
 
 // Set sets a label name in the wrapped Metric to a given value and copies the
 // Metric initially, if it is not already a copy.
-func (m COWMetric) Set(ln LabelName, lv LabelValue) {
+func (m *COWMetric) Set(ln LabelName, lv LabelValue) {
 	m.doCOW()
 	m.Metric[ln] = lv
 }

Godeps/_workspace/src/github.com/prometheus/client_golang/model/metric_test.go

@@ -22,7 +22,7 @@ func testMetric(t testing.TB) {
 	}{
 		{
 			input:       Metric{},
-			fingerprint: 2676020557754725067,
+			fingerprint: 14695981039346656037,
 		},
 		{
 			input: Metric{
@@ -30,31 +30,27 @@ func testMetric(t testing.TB) {
 				"occupation":   "robot",
 				"manufacturer": "westinghouse",
 			},
-			fingerprint: 13260944541294022935,
+			fingerprint: 11310079640881077873,
 		},
 		{
 			input: Metric{
 				"x": "y",
 			},
-			fingerprint: 1470933794305433534,
+			fingerprint: 13948396922932177635,
 		},
-		// The following two demonstrate a bug in fingerprinting. They
-		// should not have the same fingerprint with a sane
-		// fingerprinting function. See
-		// https://github.com/prometheus/client_golang/issues/74 .
 		{
 			input: Metric{
 				"a": "bb",
 				"b": "c",
 			},
-			fingerprint: 3734646176939799877,
+			fingerprint: 3198632812309449502,
 		},
 		{
 			input: Metric{
 				"a":  "b",
 				"bb": "c",
 			},
-			fingerprint: 3734646176939799877,
+			fingerprint: 5774953389407657638,
 		},
 	}
 
@@ -74,3 +70,52 @@ func BenchmarkMetric(b *testing.B) {
 		testMetric(b)
 	}
 }
+
+func TestCOWMetric(t *testing.T) {
+	testMetric := Metric{
+		"to_delete": "test1",
+		"to_change": "test2",
+	}
+
+	scenarios := []struct {
+		fn  func(*COWMetric)
+		out Metric
+	}{
+		{
+			fn: func(cm *COWMetric) {
+				cm.Delete("to_delete")
+			},
+			out: Metric{
+				"to_change": "test2",
+			},
+		},
+		{
+			fn: func(cm *COWMetric) {
+				cm.Set("to_change", "changed")
+			},
+			out: Metric{
+				"to_delete": "test1",
+				"to_change": "changed",
+			},
+		},
+	}
+
+	for i, s := range scenarios {
+		orig := testMetric.Clone()
+		cm := &COWMetric{
+			Metric: orig,
+		}
+
+		s.fn(cm)
+
+		// Test that the original metric was not modified.
+		if !orig.Equal(testMetric) {
+			t.Fatalf("%d. original metric changed; expected %v, got %v", i, testMetric, orig)
+		}
+
+		// Test that the new metric has the right changes.
+		if !cm.Metric.Equal(s.out) {
+			t.Fatalf("%d. copied metric doesn't contain expected changes; expected %v, got %v", i, s.out, cm.Metric)
+		}
+	}
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/model/signature.go

@@ -17,6 +17,7 @@ import (
 	"bytes"
 	"hash"
 	"hash/fnv"
+	"sync"
 )
 
 // SeparatorByte is a byte that cannot occur in valid UTF-8 sequences and is
@@ -28,7 +29,7 @@ var (
 	// cache the signature of an empty label set.
 	emptyLabelSignature = fnv.New64a().Sum64()
 
-	hashAndBufPool = make(chan *hashAndBuf, 1024)
+	hashAndBufPool sync.Pool
 )
 
 type hashAndBuf struct {
@@ -37,19 +38,15 @@ type hashAndBuf struct {
 }
 
 func getHashAndBuf() *hashAndBuf {
-	select {
-	case hb := <-hashAndBufPool:
-		return hb
-	default:
+	hb := hashAndBufPool.Get()
+	if hb == nil {
 		return &hashAndBuf{h: fnv.New64a()}
 	}
+	return hb.(*hashAndBuf)
 }
 
 func putHashAndBuf(hb *hashAndBuf) {
-	select {
-	case hashAndBufPool <- hb:
-	default:
-	}
+	hashAndBufPool.Put(hb)
 }
 
 // LabelsToSignature returns a unique signature (i.e., fingerprint) for a given
@@ -63,10 +60,10 @@ func LabelsToSignature(labels map[string]string) uint64 {
 	hb := getHashAndBuf()
 	defer putHashAndBuf(hb)
 
-	for k, v := range labels {
-		hb.b.WriteString(k)
+	for labelName, labelValue := range labels {
+		hb.b.WriteString(labelName)
 		hb.b.WriteByte(SeparatorByte)
-		hb.b.WriteString(v)
+		hb.b.WriteString(labelValue)
 		hb.h.Write(hb.b.Bytes())
 		result ^= hb.h.Sum64()
 		hb.h.Reset()
@@ -75,10 +72,34 @@ func LabelsToSignature(labels map[string]string) uint64 {
 	return result
 }
 
-// LabelValuesToSignature returns a unique signature (i.e., fingerprint) for the
-// values of a given label set.
-func LabelValuesToSignature(labels map[string]string) uint64 {
-	if len(labels) == 0 {
+// metricToFingerprint works exactly as LabelsToSignature but takes a Metric as
+// parameter (rather than a label map) and returns a Fingerprint.
+func metricToFingerprint(m Metric) Fingerprint {
+	if len(m) == 0 {
+		return Fingerprint(emptyLabelSignature)
+	}
+
+	var result uint64
+	hb := getHashAndBuf()
+	defer putHashAndBuf(hb)
+
+	for labelName, labelValue := range m {
+		hb.b.WriteString(string(labelName))
+		hb.b.WriteByte(SeparatorByte)
+		hb.b.WriteString(string(labelValue))
+		hb.h.Write(hb.b.Bytes())
+		result ^= hb.h.Sum64()
+		hb.h.Reset()
+		hb.b.Reset()
+	}
+	return Fingerprint(result)
+}
+
+// SignatureForLabels works like LabelsToSignature but takes a Metric as
+// parameter (rather than a label map) and only includes the labels with the
+// specified LabelNames into the signature calculation.
+func SignatureForLabels(m Metric, labels LabelNames) uint64 {
+	if len(m) == 0 || len(labels) == 0 {
 		return emptyLabelSignature
 	}
 
@@ -86,8 +107,10 @@ func LabelValuesToSignature(labels map[string]string) uint64 {
 	hb := getHashAndBuf()
 	defer putHashAndBuf(hb)
 
-	for _, v := range labels {
-		hb.b.WriteString(v)
+	for _, label := range labels {
+		hb.b.WriteString(string(label))
+		hb.b.WriteByte(SeparatorByte)
+		hb.b.WriteString(string(m[label]))
 		hb.h.Write(hb.b.Bytes())
 		result ^= hb.h.Sum64()
 		hb.h.Reset()
@@ -95,3 +118,33 @@ func LabelValuesToSignature(labels map[string]string) uint64 {
 	}
 	return result
 }
+
+// SignatureWithoutLabels works like LabelsToSignature but takes a Metric as
+// parameter (rather than a label map) and excludes the labels with any of the
+// specified LabelNames from the signature calculation.
+func SignatureWithoutLabels(m Metric, labels map[LabelName]struct{}) uint64 {
+	if len(m) == 0 {
+		return emptyLabelSignature
+	}
+
+	var result uint64
+	hb := getHashAndBuf()
+	defer putHashAndBuf(hb)
+
+	for labelName, labelValue := range m {
+		if _, exclude := labels[labelName]; exclude {
+			continue
+		}
+		hb.b.WriteString(string(labelName))
+		hb.b.WriteByte(SeparatorByte)
+		hb.b.WriteString(string(labelValue))
+		hb.h.Write(hb.b.Bytes())
+		result ^= hb.h.Sum64()
+		hb.h.Reset()
+		hb.b.Reset()
+	}
+	if result == 0 {
+		return emptyLabelSignature
+	}
+	return result
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/model/signature_test.go

@@ -15,10 +15,11 @@ package model
 
 import (
 	"runtime"
+	"sync"
 	"testing"
 )
 
-func testLabelsToSignature(t testing.TB) {
+func TestLabelsToSignature(t *testing.T) {
 	var scenarios = []struct {
 		in  map[string]string
 		out uint64
@@ -42,57 +43,112 @@ func testLabelsToSignature(t testing.TB) {
 	}
 }
 
-func TestLabelToSignature(t *testing.T) {
-	testLabelsToSignature(t)
-}
-
-func TestEmptyLabelSignature(t *testing.T) {
-	input := []map[string]string{nil, {}}
-
-	var ms runtime.MemStats
-	runtime.ReadMemStats(&ms)
-
-	alloc := ms.Alloc
-
-	for _, labels := range input {
-		LabelsToSignature(labels)
+func TestMetricToFingerprint(t *testing.T) {
+	var scenarios = []struct {
+		in  Metric
+		out Fingerprint
+	}{
+		{
+			in:  Metric{},
+			out: 14695981039346656037,
+		},
+		{
+			in:  Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			out: 12952432476264840823,
+		},
 	}
 
-	runtime.ReadMemStats(&ms)
+	for i, scenario := range scenarios {
+		actual := metricToFingerprint(scenario.in)
 
-	if got := ms.Alloc; alloc != got {
-		t.Fatal("expected LabelsToSignature with empty labels not to perform allocations")
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
 	}
 }
 
-func BenchmarkLabelToSignature(b *testing.B) {
-	for i := 0; i < b.N; i++ {
-		testLabelsToSignature(b)
+func TestSignatureForLabels(t *testing.T) {
+	var scenarios = []struct {
+		in     Metric
+		labels LabelNames
+		out    uint64
+	}{
+		{
+			in:     Metric{},
+			labels: nil,
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: LabelNames{"fear", "name"},
+			out:    12952432476264840823,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough", "foo": "bar"},
+			labels: LabelNames{"fear", "name"},
+			out:    12952432476264840823,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: LabelNames{},
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: nil,
+			out:    14695981039346656037,
+		},
 	}
-}
 
-func benchmarkLabelValuesToSignature(b *testing.B, l map[string]string, e uint64) {
-	for i := 0; i < b.N; i++ {
-		if a := LabelValuesToSignature(l); a != e {
-			b.Fatalf("expected signature of %d for %s, got %d", e, l, a)
+	for i, scenario := range scenarios {
+		actual := SignatureForLabels(scenario.in, scenario.labels)
+
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
 		}
 	}
 }
 
-func BenchmarkLabelValuesToSignatureScalar(b *testing.B) {
-	benchmarkLabelValuesToSignature(b, nil, 14695981039346656037)
-}
-
-func BenchmarkLabelValuesToSignatureSingle(b *testing.B) {
-	benchmarkLabelValuesToSignature(b, map[string]string{"first-label": "first-label-value"}, 2653746141194979650)
-}
+func TestSignatureWithoutLabels(t *testing.T) {
+	var scenarios = []struct {
+		in     Metric
+		labels map[LabelName]struct{}
+		out    uint64
+	}{
+		{
+			in:     Metric{},
+			labels: nil,
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: map[LabelName]struct{}{"fear": struct{}{}, "name": struct{}{}},
+			out:    14695981039346656037,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough", "foo": "bar"},
+			labels: map[LabelName]struct{}{"foo": struct{}{}},
+			out:    12952432476264840823,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: map[LabelName]struct{}{},
+			out:    12952432476264840823,
+		},
+		{
+			in:     Metric{"name": "garland, briggs", "fear": "love is not enough"},
+			labels: nil,
+			out:    12952432476264840823,
+		},
+	}
 
-func BenchmarkLabelValuesToSignatureDouble(b *testing.B) {
-	benchmarkLabelValuesToSignature(b, map[string]string{"first-label": "first-label-value", "second-label": "second-label-value"}, 8893559499616767364)
-}
+	for i, scenario := range scenarios {
+		actual := SignatureWithoutLabels(scenario.in, scenario.labels)
 
-func BenchmarkLabelValuesToSignatureTriple(b *testing.B) {
-	benchmarkLabelValuesToSignature(b, map[string]string{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 1685970066862087833)
+		if actual != scenario.out {
+			t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
+		}
+	}
 }
 
 func benchmarkLabelToSignature(b *testing.B, l map[string]string, e uint64) {
@@ -118,3 +174,83 @@ func BenchmarkLabelToSignatureDouble(b *testing.B) {
 func BenchmarkLabelToSignatureTriple(b *testing.B) {
 	benchmarkLabelToSignature(b, map[string]string{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676)
 }
+
+func benchmarkMetricToFingerprint(b *testing.B, m Metric, e Fingerprint) {
+	for i := 0; i < b.N; i++ {
+		if a := metricToFingerprint(m); a != e {
+			b.Fatalf("expected signature of %d for %s, got %d", e, m, a)
+		}
+	}
+}
+
+func BenchmarkMetricToFingerprintScalar(b *testing.B) {
+	benchmarkMetricToFingerprint(b, nil, 14695981039346656037)
+}
+
+func BenchmarkMetricToFingerprintSingle(b *testing.B) {
+	benchmarkMetricToFingerprint(b, Metric{"first-label": "first-label-value"}, 5147259542624943964)
+}
+
+func BenchmarkMetricToFingerprintDouble(b *testing.B) {
+	benchmarkMetricToFingerprint(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value"}, 18269973311206963528)
+}
+
+func BenchmarkMetricToFingerprintTriple(b *testing.B) {
+	benchmarkMetricToFingerprint(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676)
+}
+
+func TestEmptyLabelSignature(t *testing.T) {
+	input := []map[string]string{nil, {}}
+
+	var ms runtime.MemStats
+	runtime.ReadMemStats(&ms)
+
+	alloc := ms.Alloc
+
+	for _, labels := range input {
+		LabelsToSignature(labels)
+	}
+
+	runtime.ReadMemStats(&ms)
+
+	if got := ms.Alloc; alloc != got {
+		t.Fatal("expected LabelsToSignature with empty labels not to perform allocations")
+	}
+}
+
+func benchmarkMetricToFingerprintConc(b *testing.B, m Metric, e Fingerprint, concLevel int) {
+	var start, end sync.WaitGroup
+	start.Add(1)
+	end.Add(concLevel)
+
+	for i := 0; i < concLevel; i++ {
+		go func() {
+			start.Wait()
+			for j := b.N / concLevel; j >= 0; j-- {
+				if a := metricToFingerprint(m); a != e {
+					b.Fatalf("expected signature of %d for %s, got %d", e, m, a)
+				}
+			}
+			end.Done()
+		}()
+	}
+	b.ResetTimer()
+	start.Done()
+	end.Wait()
+}
+
+func BenchmarkMetricToFingerprintTripleConc1(b *testing.B) {
+	benchmarkMetricToFingerprintConc(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 1)
+}
+
+func BenchmarkMetricToFingerprintTripleConc2(b *testing.B) {
+	benchmarkMetricToFingerprintConc(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 2)
+}
+
+func BenchmarkMetricToFingerprintTripleConc4(b *testing.B) {
+	benchmarkMetricToFingerprintConc(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 4)
+}
+
+func BenchmarkMetricToFingerprintTripleConc8(b *testing.B) {
+	benchmarkMetricToFingerprintConc(b, Metric{"first-label": "first-label-value", "second-label": "second-label-value", "third-label": "third-label-value"}, 15738406913934009676, 8)
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/model/timestamp.go

@@ -88,6 +88,7 @@ func (t Timestamp) String() string {
 	return strconv.FormatFloat(float64(t)/float64(second), 'f', -1, 64)
 }
 
+// MarshalJSON implements the json.Marshaler interface.
 func (t Timestamp) MarshalJSON() ([]byte, error) {
 	return []byte(t.String()), nil
 }

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/examples_test.go

@@ -18,8 +18,10 @@ import (
 	"fmt"
 	"math"
 	"net/http"
+	"os"
 	"runtime"
 	"sort"
+	"time"
 
 	dto "github.com/prometheus/client_model/go"
 
@@ -498,3 +500,19 @@ func ExampleHistogram() {
 	//   >
 	// >
 }
+
+func ExamplePushCollectors() {
+	hostname, _ := os.Hostname()
+	completionTime := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "db_backup_last_completion_time",
+		Help: "The timestamp of the last succesful completion of a DB backup.",
+	})
+	completionTime.Set(float64(time.Now().Unix()))
+	if err := prometheus.PushCollectors(
+		"db_backup", hostname,
+		"http://pushgateway:9091",
+		completionTime,
+	); err != nil {
+		fmt.Println("Could not push completion time to Pushgateway:", err)
+	}
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/process_collector.go

@@ -13,6 +13,8 @@
 
 package prometheus
 
+import "github.com/prometheus/procfs"
+
 type processCollector struct {
 	pid             int
 	collectFn       func(chan<- Metric)
@@ -79,7 +81,7 @@ func NewProcessCollectorPIDFn(
 	}
 
 	// Set up process metric collection if supported by the runtime.
-	if processCollectSupported() {
+	if _, err := procfs.NewStat(); err == nil {
 		c.collectFn = c.processCollect
 	}
 
@@ -100,3 +102,41 @@ func (c *processCollector) Describe(ch chan<- *Desc) {
 func (c *processCollector) Collect(ch chan<- Metric) {
 	c.collectFn(ch)
 }
+
+// TODO(ts): Bring back error reporting by reverting 7faf9e7 as soon as the
+// client allows users to configure the error behavior.
+func (c *processCollector) processCollect(ch chan<- Metric) {
+	pid, err := c.pidFn()
+	if err != nil {
+		return
+	}
+
+	p, err := procfs.NewProc(pid)
+	if err != nil {
+		return
+	}
+
+	if stat, err := p.NewStat(); err == nil {
+		c.cpuTotal.Set(stat.CPUTime())
+		ch <- c.cpuTotal
+		c.vsize.Set(float64(stat.VirtualMemory()))
+		ch <- c.vsize
+		c.rss.Set(float64(stat.ResidentMemory()))
+		ch <- c.rss
+
+		if startTime, err := stat.StartTime(); err == nil {
+			c.startTime.Set(startTime)
+			ch <- c.startTime
+		}
+	}
+
+	if fds, err := p.FileDescriptorsLen(); err == nil {
+		c.openFDs.Set(float64(fds))
+		ch <- c.openFDs
+	}
+
+	if limits, err := p.NewLimits(); err == nil {
+		c.maxFDs.Set(float64(limits.OpenFiles))
+		ch <- c.maxFDs
+	}
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/process_collector_procfs.go

-// Copyright 2015 The Prometheus 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.
-
-// +build linux,cgo plan9,cgo solaris,cgo
-
-package prometheus
-
-import "github.com/prometheus/procfs"
-
-func processCollectSupported() bool {
-	if _, err := procfs.NewStat(); err == nil {
-		return true
-	}
-	return false
-}
-
-// TODO(ts): Bring back error reporting by reverting 7faf9e7 as soon as the
-// client allows users to configure the error behavior.
-func (c *processCollector) processCollect(ch chan<- Metric) {
-	pid, err := c.pidFn()
-	if err != nil {
-		return
-	}
-
-	p, err := procfs.NewProc(pid)
-	if err != nil {
-		return
-	}
-
-	if stat, err := p.NewStat(); err == nil {
-		c.cpuTotal.Set(stat.CPUTime())
-		ch <- c.cpuTotal
-		c.vsize.Set(float64(stat.VirtualMemory()))
-		ch <- c.vsize
-		c.rss.Set(float64(stat.ResidentMemory()))
-		ch <- c.rss
-
-		if startTime, err := stat.StartTime(); err == nil {
-			c.startTime.Set(startTime)
-			ch <- c.startTime
-		}
-	}
-
-	if fds, err := p.FileDescriptorsLen(); err == nil {
-		c.openFDs.Set(float64(fds))
-		ch <- c.openFDs
-	}
-
-	if limits, err := p.NewLimits(); err == nil {
-		c.maxFDs.Set(float64(limits.OpenFiles))
-		ch <- c.maxFDs
-	}
-}

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/process_collector_rest.go

-// Copyright 2015 The Prometheus 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.
-
-// +build !linux,!plan9,!solaris !cgo
-
-package prometheus
-
-func processCollectSupported() bool {
-	return false
-}
-
-func (c *processCollector) processCollect(ch chan<- Metric) {
-	panic("unreachable")
-}

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/push.go

+// Copyright 2015 The Prometheus 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.
+
+// Copyright (c) 2013, The Prometheus Authors
+// All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file.
+
+package prometheus
+
+// Push triggers a metric collection by the default registry and pushes all
+// collected metrics to the Pushgateway specified by addr. See the Pushgateway
+// documentation for detailed implications of the job and instance
+// parameter. instance can be left empty. You can use just host:port or ip:port
+// as url, in which case 'http://' is added automatically. You can also include
+// the schema in the URL. However, do not include the '/metrics/jobs/...' part.
+//
+// Note that all previously pushed metrics with the same job and instance will
+// be replaced with the metrics pushed by this call. (It uses HTTP method 'PUT'
+// to push to the Pushgateway.)
+func Push(job, instance, url string) error {
+	return defRegistry.Push(job, instance, url, "PUT")
+}
+
+// PushAdd works like Push, but only previously pushed metrics with the same
+// name (and the same job and instance) will be replaced. (It uses HTTP method
+// 'POST' to push to the Pushgateway.)
+func PushAdd(job, instance, url string) error {
+	return defRegistry.Push(job, instance, url, "POST")
+}
+
+// PushCollectors works like Push, but it does not collect from the default
+// registry. Instead, it collects from the provided collectors. It is a
+// convenient way to push only a few metrics.
+func PushCollectors(job, instance, url string, collectors ...Collector) error {
+	return pushCollectors(job, instance, url, "PUT", collectors...)
+}
+
+// PushAddCollectors works like PushAdd, but it does not collect from the
+// default registry. Instead, it collects from the provided collectors. It is a
+// convenient way to push only a few metrics.
+func PushAddCollectors(job, instance, url string, collectors ...Collector) error {
+	return pushCollectors(job, instance, url, "POST", collectors...)
+}
+
+func pushCollectors(job, instance, url, method string, collectors ...Collector) error {
+	r := newRegistry()
+	for _, collector := range collectors {
+		if _, err := r.Register(collector); err != nil {
+			return err
+		}
+	}
+	return r.Push(job, instance, url, method)
+}

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/registry.go

@@ -158,14 +158,19 @@ func Unregister(c Collector) bool {
 // SetMetricFamilyInjectionHook sets a function that is called whenever metrics
 // are collected. The hook function must be set before metrics collection begins
 // (i.e. call SetMetricFamilyInjectionHook before setting the HTTP handler.) The
-// MetricFamily protobufs returned by the hook function are added to the
-// delivered metrics. Each returned MetricFamily must have a unique name (also
-// taking into account the MetricFamilies created in the regular way).
+// MetricFamily protobufs returned by the hook function are merged with the
+// metrics collected in the usual way.
 //
 // This is a way to directly inject MetricFamily protobufs managed and owned by
-// the caller. The caller has full responsibility. No sanity checks are
-// performed on the returned protobufs (besides the name checks described
-// above). The function must be callable at any time and concurrently.
+// the caller. The caller has full responsibility. As no registration of the
+// injected metrics has happened, there is no descriptor to check against, and
+// there are no registration-time checks. If collect-time checks are disabled
+// (see function EnableCollectChecks), no sanity checks are performed on the
+// returned protobufs at all. If collect-checks are enabled, type and uniqueness
+// checks are performed, but no further consistency checks (which would require
+// knowledge of a metric descriptor).
+//
+// The function must be callable at any time and concurrently.
 func SetMetricFamilyInjectionHook(hook func() []*dto.MetricFamily) {
 	defRegistry.metricFamilyInjectionHook = hook
 }
@@ -187,30 +192,10 @@ func EnableCollectChecks(b bool) {
 	defRegistry.collectChecksEnabled = b
 }
 
-// Push triggers a metric collection and pushes all collected metrics to the
-// Pushgateway specified by addr. See the Pushgateway documentation for detailed
-// implications of the job and instance parameter. instance can be left
-// empty. The Pushgateway will then use the client's IP number instead. Use just
-// host:port or ip:port ass addr. (Don't add 'http://' or any path.)
-//
-// Note that all previously pushed metrics with the same job and instance will
-// be replaced with the metrics pushed by this call. (It uses HTTP method 'PUT'
-// to push to the Pushgateway.)
-func Push(job, instance, addr string) error {
-	return defRegistry.Push(job, instance, addr, "PUT")
-}
-
-// PushAdd works like Push, but only previously pushed metrics with the same
-// name (and the same job and instance) will be replaced. (It uses HTTP method
-// 'POST' to push to the Pushgateway.)
-func PushAdd(job, instance, addr string) error {
-	return defRegistry.Push(job, instance, addr, "POST")
-}
-
 // encoder is a function that writes a dto.MetricFamily to an io.Writer in a
 // certain encoding. It returns the number of bytes written and any error
-// encountered.  Note that ext.WriteDelimited and text.MetricFamilyToText are
-// encoders.
+// encountered.  Note that pbutil.WriteDelimited and pbutil.MetricFamilyToText
+// are encoders.
 type encoder func(io.Writer, *dto.MetricFamily) (int, error)
 
 type registry struct {
@@ -346,10 +331,13 @@ func (r *registry) Unregister(c Collector) bool {
 	return true
 }
 
-func (r *registry) Push(job, instance, addr, method string) error {
-	u := fmt.Sprintf("http://%s/metrics/jobs/%s", addr, url.QueryEscape(job))
+func (r *registry) Push(job, instance, pushURL, method string) error {
+	if !strings.Contains(pushURL, "://") {
+		pushURL = "http://" + pushURL
+	}
+	pushURL = fmt.Sprintf("%s/metrics/jobs/%s", pushURL, url.QueryEscape(job))
 	if instance != "" {
-		u += "/instances/" + url.QueryEscape(instance)
+		pushURL += "/instances/" + url.QueryEscape(instance)
 	}
 	buf := r.getBuf()
 	defer r.giveBuf(buf)
@@ -359,7 +347,7 @@ func (r *registry) Push(job, instance, addr, method string) error {
 		}
 		return err
 	}
-	req, err := http.NewRequest(method, u, buf)
+	req, err := http.NewRequest(method, pushURL, buf)
 	if err != nil {
 		return err
 	}
@@ -370,7 +358,7 @@ func (r *registry) Push(job, instance, addr, method string) error {
 	}
 	defer resp.Body.Close()
 	if resp.StatusCode != 202 {
-		return fmt.Errorf("unexpected status code %d while pushing to %s", resp.StatusCode, u)
+		return fmt.Errorf("unexpected status code %d while pushing to %s", resp.StatusCode, pushURL)
 	}
 	return nil
 }
@@ -479,10 +467,26 @@ func (r *registry) writePB(w io.Writer, writeEncoded encoder) (int, error) {
 
 	if r.metricFamilyInjectionHook != nil {
 		for _, mf := range r.metricFamilyInjectionHook() {
-			if _, exists := metricFamiliesByName[mf.GetName()]; exists {
-				return 0, fmt.Errorf("metric family with duplicate name injected: %s", mf)
+			existingMF, exists := metricFamiliesByName[mf.GetName()]
+			if !exists {
+				metricFamiliesByName[mf.GetName()] = mf
+				if r.collectChecksEnabled {
+					for _, m := range mf.Metric {
+						if err := r.checkConsistency(mf, m, nil, metricHashes); err != nil {
+							return 0, err
+						}
+					}
+				}
+				continue
+			}
+			for _, m := range mf.Metric {
+				if r.collectChecksEnabled {
+					if err := r.checkConsistency(existingMF, m, nil, metricHashes); err != nil {
+						return 0, err
+					}
+				}
+				existingMF.Metric = append(existingMF.Metric, m)
 			}
-			metricFamiliesByName[mf.GetName()] = mf
 		}
 	}
 
@@ -523,11 +527,42 @@ func (r *registry) checkConsistency(metricFamily *dto.MetricFamily, dtoMetric *d
 		)
 	}
 
+	// Is the metric unique (i.e. no other metric with the same name and the same label values)?
+	h := fnv.New64a()
+	var buf bytes.Buffer
+	buf.WriteString(metricFamily.GetName())
+	buf.WriteByte(model.SeparatorByte)
+	h.Write(buf.Bytes())
+	for _, lp := range dtoMetric.Label {
+		buf.Reset()
+		buf.WriteString(lp.GetValue())
+		buf.WriteByte(model.SeparatorByte)
+		h.Write(buf.Bytes())
+	}
+	metricHash := h.Sum64()
+	if _, exists := metricHashes[metricHash]; exists {
+		return fmt.Errorf(
+			"collected metric %q was collected before with the same name and label values",
+			dtoMetric,
+		)
+	}
+	metricHashes[metricHash] = struct{}{}
+
+	if desc == nil {
+		return nil // Nothing left to check if we have no desc.
+	}
+
 	// Desc consistency with metric family.
+	if metricFamily.GetName() != desc.fqName {
+		return fmt.Errorf(
+			"collected metric %q has name %q but should have %q",
+			dtoMetric, metricFamily.GetName(), desc.fqName,
+		)
+	}
 	if metricFamily.GetHelp() != desc.help {
 		return fmt.Errorf(
 			"collected metric %q has help %q but should have %q",
-			dtoMetric, desc.help, metricFamily.GetHelp(),
+			dtoMetric, metricFamily.GetHelp(), desc.help,
 		)
 	}
 
@@ -557,27 +592,6 @@ func (r *registry) checkConsistency(metricFamily *dto.MetricFamily, dtoMetric *d
 		}
 	}
 
-	// Is the metric unique (i.e. no other metric with the same name and the same label values)?
-	h := fnv.New64a()
-	var buf bytes.Buffer
-	buf.WriteString(desc.fqName)
-	buf.WriteByte(model.SeparatorByte)
-	h.Write(buf.Bytes())
-	for _, lp := range dtoMetric.Label {
-		buf.Reset()
-		buf.WriteString(lp.GetValue())
-		buf.WriteByte(model.SeparatorByte)
-		h.Write(buf.Bytes())
-	}
-	metricHash := h.Sum64()
-	if _, exists := metricHashes[metricHash]; exists {
-		return fmt.Errorf(
-			"collected metric %q was collected before with the same name and label values",
-			dtoMetric,
-		)
-	}
-	metricHashes[metricHash] = struct{}{}
-
 	r.mtx.RLock() // Remaining checks need the read lock.
 	defer r.mtx.RUnlock()
 
@@ -712,6 +726,15 @@ func (s metricSorter) Swap(i, j int) {
 }
 
 func (s metricSorter) Less(i, j int) bool {
+	if len(s[i].Label) != len(s[j].Label) {
+		// This should not happen. The metrics are
+		// inconsistent. However, we have to deal with the fact, as
+		// people might use custom collectors or metric family injection
+		// to create inconsistent metrics. So let's simply compare the
+		// number of labels in this case. That will still yield
+		// reproducible sorting.
+		return len(s[i].Label) < len(s[j].Label)
+	}
 	for n, lp := range s[i].Label {
 		vi := lp.GetValue()
 		vj := s[j].Label[n].GetValue()

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/registry_test.go

@@ -61,31 +61,29 @@ func testHandler(t testing.TB) {
 
 	varintBuf := make([]byte, binary.MaxVarintLen32)
 
-	externalMetricFamily := []*dto.MetricFamily{
-		{
-			Name: proto.String("externalname"),
-			Help: proto.String("externaldocstring"),
-			Type: dto.MetricType_COUNTER.Enum(),
-			Metric: []*dto.Metric{
-				{
-					Label: []*dto.LabelPair{
-						{
-							Name:  proto.String("externallabelname"),
-							Value: proto.String("externalval1"),
-						},
-						{
-							Name:  proto.String("externalconstname"),
-							Value: proto.String("externalconstvalue"),
-						},
+	externalMetricFamily := &dto.MetricFamily{
+		Name: proto.String("externalname"),
+		Help: proto.String("externaldocstring"),
+		Type: dto.MetricType_COUNTER.Enum(),
+		Metric: []*dto.Metric{
+			{
+				Label: []*dto.LabelPair{
+					{
+						Name:  proto.String("externallabelname"),
+						Value: proto.String("externalval1"),
 					},
-					Counter: &dto.Counter{
-						Value: proto.Float64(1),
+					{
+						Name:  proto.String("externalconstname"),
+						Value: proto.String("externalconstvalue"),
 					},
 				},
+				Counter: &dto.Counter{
+					Value: proto.Float64(1),
+				},
 			},
 		},
 	}
-	marshaledExternalMetricFamily, err := proto.Marshal(externalMetricFamily[0])
+	marshaledExternalMetricFamily, err := proto.Marshal(externalMetricFamily)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -216,16 +214,42 @@ metric: <
 	expectedMetricFamilyAsProtoCompactText := []byte(`name:"name" help:"docstring" type:COUNTER metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val1" > counter:<value:1 > > metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val2" > counter:<value:1 > > 
 `)
 
+	externalMetricFamilyWithSameName := &dto.MetricFamily{
+		Name: proto.String("name"),
+		Help: proto.String("inconsistent help string does not matter here"),
+		Type: dto.MetricType_COUNTER.Enum(),
+		Metric: []*dto.Metric{
+			{
+				Label: []*dto.LabelPair{
+					{
+						Name:  proto.String("constname"),
+						Value: proto.String("constvalue"),
+					},
+					{
+						Name:  proto.String("labelname"),
+						Value: proto.String("different_val"),
+					},
+				},
+				Counter: &dto.Counter{
+					Value: proto.Float64(42),
+				},
+			},
+		},
+	}
+
+	expectedMetricFamilyMergedWithExternalAsProtoCompactText := []byte(`name:"name" help:"docstring" type:COUNTER metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"different_val" > counter:<value:42 > > metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val1" > counter:<value:1 > > metric:<label:<name:"constname" value:"constvalue" > label:<name:"labelname" value:"val2" > counter:<value:1 > > 
+`)
+
 	type output struct {
 		headers map[string]string
 		body    []byte
 	}
 
 	var scenarios = []struct {
-		headers        map[string]string
-		out            output
-		withCounter    bool
-		withExternalMF bool
+		headers    map[string]string
+		out        output
+		collector  Collector
+		externalMF []*dto.MetricFamily
 	}{
 		{ // 0
 			headers: map[string]string{
@@ -281,7 +305,7 @@ metric: <
 				},
 				body: expectedMetricFamilyAsText,
 			},
-			withCounter: true,
+			collector: metricVec,
 		},
 		{ // 5
 			headers: map[string]string{
@@ -293,7 +317,7 @@ metric: <
 				},
 				body: expectedMetricFamilyAsBytes,
 			},
-			withCounter: true,
+			collector: metricVec,
 		},
 		{ // 6
 			headers: map[string]string{
@@ -305,7 +329,7 @@ metric: <
 				},
 				body: externalMetricFamilyAsText,
 			},
-			withExternalMF: true,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 7
 			headers: map[string]string{
@@ -317,7 +341,7 @@ metric: <
 				},
 				body: externalMetricFamilyAsBytes,
 			},
-			withExternalMF: true,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 8
 			headers: map[string]string{
@@ -335,8 +359,8 @@ metric: <
 					[]byte{},
 				),
 			},
-			withCounter:    true,
-			withExternalMF: true,
+			collector:  metricVec,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 9
 			headers: map[string]string{
@@ -359,7 +383,7 @@ metric: <
 				},
 				body: expectedMetricFamilyAsText,
 			},
-			withCounter: true,
+			collector: metricVec,
 		},
 		{ // 11
 			headers: map[string]string{
@@ -377,8 +401,8 @@ metric: <
 					[]byte{},
 				),
 			},
-			withCounter:    true,
-			withExternalMF: true,
+			collector:  metricVec,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 12
 			headers: map[string]string{
@@ -396,8 +420,8 @@ metric: <
 					[]byte{},
 				),
 			},
-			withCounter:    true,
-			withExternalMF: true,
+			collector:  metricVec,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 13
 			headers: map[string]string{
@@ -415,8 +439,8 @@ metric: <
 					[]byte{},
 				),
 			},
-			withCounter:    true,
-			withExternalMF: true,
+			collector:  metricVec,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
 		},
 		{ // 14
 			headers: map[string]string{
@@ -434,20 +458,42 @@ metric: <
 					[]byte{},
 				),
 			},
-			withCounter:    true,
-			withExternalMF: true,
+			collector:  metricVec,
+			externalMF: []*dto.MetricFamily{externalMetricFamily},
+		},
+		{ // 15
+			headers: map[string]string{
+				"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=compact-text",
+			},
+			out: output{
+				headers: map[string]string{
+					"Content-Type": `application/vnd.google.protobuf; proto=io.prometheus.client.MetricFamily; encoding=compact-text`,
+				},
+				body: bytes.Join(
+					[][]byte{
+						externalMetricFamilyAsProtoCompactText,
+						expectedMetricFamilyMergedWithExternalAsProtoCompactText,
+					},
+					[]byte{},
+				),
+			},
+			collector: metricVec,
+			externalMF: []*dto.MetricFamily{
+				externalMetricFamily,
+				externalMetricFamilyWithSameName,
+			},
 		},
 	}
 	for i, scenario := range scenarios {
 		registry := newRegistry()
 		registry.collectChecksEnabled = true
 
-		if scenario.withCounter {
-			registry.Register(metricVec)
+		if scenario.collector != nil {
+			registry.Register(scenario.collector)
 		}
-		if scenario.withExternalMF {
+		if scenario.externalMF != nil {
 			registry.metricFamilyInjectionHook = func() []*dto.MetricFamily {
-				return externalMetricFamily
+				return scenario.externalMF
 			}
 		}
 		writer := &fakeResponseWriter{

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/summary.go

@@ -16,6 +16,7 @@ package prometheus
 import (
 	"fmt"
 	"hash/fnv"
+	"math"
 	"sort"
 	"sync"
 	"time"
@@ -277,10 +278,8 @@ func (s *summary) Write(out *dto.Metric) error {
 
 	s.bufMtx.Lock()
 	s.mtx.Lock()
-
-	if len(s.hotBuf) != 0 {
-		s.swapBufs(time.Now())
-	}
+	// Swap bufs even if hotBuf is empty to set new hotBufExpTime.
+	s.swapBufs(time.Now())
 	s.bufMtx.Unlock()
 
 	s.flushColdBuf()
@@ -288,9 +287,15 @@ func (s *summary) Write(out *dto.Metric) error {
 	sum.SampleSum = proto.Float64(s.sum)
 
 	for _, rank := range s.sortedObjectives {
+		var q float64
+		if s.headStream.Count() == 0 {
+			q = math.NaN()
+		} else {
+			q = s.headStream.Query(rank)
+		}
 		qs = append(qs, &dto.Quantile{
 			Quantile: proto.Float64(rank),
-			Value:    proto.Float64(s.headStream.Query(rank)),
+			Value:    proto.Float64(q),
 		})
 	}
 

Godeps/_workspace/src/github.com/prometheus/client_golang/prometheus/summary_test.go

@@ -289,6 +289,11 @@ func TestSummaryVecConcurrency(t *testing.T) {
 }
 
 func TestSummaryDecay(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping test in short mode.")
+		// More because it depends on timing than because it is particularly long...
+	}
+
 	sum := NewSummary(SummaryOpts{
 		Name:       "test_summary",
 		Help:       "helpless",
@@ -315,6 +320,12 @@ func TestSummaryDecay(t *testing.T) {
 		}
 	}
 	tick.Stop()
+	// Wait for MaxAge without observations and make sure quantiles are NaN.
+	time.Sleep(100 * time.Millisecond)
+	sum.Write(m)
+	if got := *m.Summary.Quantile[0].Value; !math.IsNaN(got) {
+		t.Errorf("got %f, want NaN after expiration", got)
+	}
 }
 
 func getBounds(vars []float64, q, ε float64) (min, max float64) {

Godeps/_workspace/src/github.com/prometheus/client_golang/text/bench_test.go

@@ -21,7 +21,7 @@ import (
 	"testing"
 	dto "github.com/prometheus/client_model/go"
 
-	"github.com/matttproud/golang_protobuf_extensions/ext"
+	"github.com/matttproud/golang_protobuf_extensions/pbutil"
 )
 
 // Benchmarks to show how much penalty text format parsing actually inflicts.
@@ -101,7 +101,7 @@ func BenchmarkParseProto(b *testing.B) {
 		in := bytes.NewReader(data)
 		for {
 			family.Reset()
-			if _, err := ext.ReadDelimited(in, family); err != nil {
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
 				if err == io.EOF {
 					break
 				}
@@ -129,7 +129,7 @@ func BenchmarkParseProtoGzip(b *testing.B) {
 		}
 		for {
 			family.Reset()
-			if _, err := ext.ReadDelimited(in, family); err != nil {
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
 				if err == io.EOF {
 					break
 				}
@@ -156,7 +156,7 @@ func BenchmarkParseProtoMap(b *testing.B) {
 		in := bytes.NewReader(data)
 		for {
 			family := &dto.MetricFamily{}
-			if _, err := ext.ReadDelimited(in, family); err != nil {
+			if _, err := pbutil.ReadDelimited(in, family); err != nil {
 				if err == io.EOF {
 					break
 				}

Godeps/_workspace/src/github.com/prometheus/client_golang/text/parse_test.go

@@ -385,7 +385,7 @@ request_duration_microseconds_count 2693
 					},
 				},
 			},
-                },
+		},
 	}
 
 	for i, scenario := range scenarios {

Godeps/_workspace/src/github.com/prometheus/client_golang/text/proto.go

@@ -18,7 +18,7 @@ import (
 	"io"
 
 	"github.com/golang/protobuf/proto"
-	"github.com/matttproud/golang_protobuf_extensions/ext"
+	"github.com/matttproud/golang_protobuf_extensions/pbutil"
 
 	dto "github.com/prometheus/client_model/go"
 )
@@ -27,7 +27,7 @@ import (
 // protobuf format and returns the number of bytes written and any error
 // encountered.
 func WriteProtoDelimited(w io.Writer, p *dto.MetricFamily) (int, error) {
-	return ext.WriteDelimited(w, p)
+	return pbutil.WriteDelimited(w, p)
 }
 
 // WriteProtoText writes the MetricFamily to the writer in text format and

Godeps/_workspace/src/github.com/prometheus/procfs/.travis.yml

+language: go
+go:
+    - 1.3
+    - 1.4
+    - tip

Godeps/_workspace/src/github.com/prometheus/procfs/README.md

@@ -4,8 +4,4 @@ This procfs package provides functions to retrieve system, kernel and process
 metrics from the pseudo-filesystem proc.
 
 [![GoDoc](https://godoc.org/github.com/prometheus/procfs?status.png)](https://godoc.org/github.com/prometheus/procfs)
-[![Circle CI](https://circleci.com/gh/prometheus/procfs.svg?style=svg)](https://circleci.com/gh/prometheus/procfs)
-
-# Testing
-
-    $ go test
+[![Build Status](https://travis-ci.org/prometheus/procfs.svg?branch=master)](https://travis-ci.org/prometheus/procfs)

Godeps/_workspace/src/github.com/prometheus/procfs/proc_stat.go

@@ -7,8 +7,22 @@ import (
 	"os"
 )
 
-// #include <unistd.h>
-import "C"
+// Originally, this USER_HZ value was dynamically retrieved via a sysconf call which
+// required cgo. However, that caused a lot of problems regarding
+// cross-compilation. Alternatives such as running a binary to determine the
+// value, or trying to derive it in some other way were all problematic.
+// After much research it was determined that USER_HZ is actually hardcoded to
+// 100 on all Go-supported platforms as of the time of this writing. This is
+// why we decided to hardcode it here as well. It is not impossible that there
+// could be systems with exceptions, but they should be very exotic edge cases,
+// and in that case, the worst outcome will be two misreported metrics.
+//
+// See also the following discussions:
+//
+// - https://github.com/prometheus/node_exporter/issues/52
+// - https://github.com/prometheus/procfs/pull/2
+// - http://stackoverflow.com/questions/17410841/how-does-user-hz-solve-the-jiffy-scaling-issue
+const userHZ = 100
 
 // ProcStat provides status information about the process,
 // read from /proc/[pid]/stat.
@@ -152,14 +166,10 @@ func (s ProcStat) StartTime() (float64, error) {
 	if err != nil {
 		return 0, err
 	}
-	return float64(stat.BootTime) + (float64(s.Starttime) / ticks()), nil
+	return float64(stat.BootTime) + (float64(s.Starttime) / userHZ), nil
 }
 
 // CPUTime returns the total CPU user and system time in seconds.
 func (s ProcStat) CPUTime() float64 {
-	return float64(s.UTime+s.STime) / ticks()
-}
-
-func ticks() float64 {
-	return float64(C.sysconf(C._SC_CLK_TCK)) // most likely 100
+	return float64(s.UTime+s.STime) / userHZ
 }