Rename metric vector method `Reset` to `Clear`

This it to bring client_golang in line with the client library
guidelines. See #218.

Signed-off-by: beorn7 <beorn@soundcloud.com>

prometheus/counter.go

@@ -154,7 +154,7 @@ func NewCounterVec(opts CounterOpts, labelNames []string) *CounterVec {
 // SummaryVec example.
 //
 // Keeping the Counter for later use is possible (and should be considered if
-// performance is critical), but keep in mind that Reset, DeleteLabelValues and
+// performance is critical), but keep in mind that Clear, DeleteLabelValues and
 // Delete can be used to delete the Counter from the CounterVec. In that case,
 // the Counter will still exist, but it will not be exported anymore, even if a
 // Counter with the same label values is created later.
@@ -230,7 +230,7 @@ func (v *CounterVec) With(labels Labels) Counter {
 // The metrics contained in the CounterVec are shared between the curried and
 // uncurried vectors. They are just accessed differently. Curried and uncurried
 // vectors behave identically in terms of collection. Only one must be
-// registered with a given registry (usually the uncurried version). The Reset
+// registered with a given registry (usually the uncurried version). The Clear
 // method deletes all metrics, even if called on a curried vector.
 func (v *CounterVec) CurryWith(labels Labels) (*CounterVec, error) {
 	vec, err := v.curryWith(labels)

prometheus/histogram.go

@@ -414,7 +414,7 @@ func NewHistogramVec(opts HistogramOpts, labelNames []string) *HistogramVec {
 // any observations.
 //
 // Keeping the Histogram for later use is possible (and should be considered if
-// performance is critical), but keep in mind that Reset, DeleteLabelValues and
+// performance is critical), but keep in mind that Clear, DeleteLabelValues and
 // Delete can be used to delete the Histogram from the HistogramVec. In that case, the
 // Histogram will still exist, but it will not be exported anymore, even if a
 // Histogram with the same label values is created later. See also the CounterVec
@@ -491,7 +491,7 @@ func (v *HistogramVec) With(labels Labels) Observer {
 // The metrics contained in the HistogramVec are shared between the curried and
 // uncurried vectors. They are just accessed differently. Curried and uncurried
 // vectors behave identically in terms of collection. Only one must be
-// registered with a given registry (usually the uncurried version). The Reset
+// registered with a given registry (usually the uncurried version). The Clear
 // method deletes all metrics, even if called on a curried vector.
 func (v *HistogramVec) CurryWith(labels Labels) (ObserverVec, error) {
 	vec, err := v.curryWith(labels)

prometheus/summary.go

@@ -426,7 +426,7 @@ func NewSummaryVec(opts SummaryOpts, labelNames []string) *SummaryVec {
 // any observations.
 //
 // Keeping the Summary for later use is possible (and should be considered if
-// performance is critical), but keep in mind that Reset, DeleteLabelValues and
+// performance is critical), but keep in mind that Clear, DeleteLabelValues and
 // Delete can be used to delete the Summary from the SummaryVec. In that case,
 // the Summary will still exist, but it will not be exported anymore, even if a
 // Summary with the same label values is created later. See also the CounterVec
@@ -503,7 +503,7 @@ func (v *SummaryVec) With(labels Labels) Observer {
 // The metrics contained in the SummaryVec are shared between the curried and
 // uncurried vectors. They are just accessed differently. Curried and uncurried
 // vectors behave identically in terms of collection. Only one must be
-// registered with a given registry (usually the uncurried version). The Reset
+// registered with a given registry (usually the uncurried version). The Clear
 // method deletes all metrics, even if called on a curried vector.
 func (v *SummaryVec) CurryWith(labels Labels) (ObserverVec, error) {
 	vec, err := v.curryWith(labels)

prometheus/vec.go

@@ -234,8 +234,8 @@ func (m *metricMap) Collect(ch chan<- Metric) {
 	}
 }
 
-// Reset deletes all metrics in this vector.
-func (m *metricMap) Reset() {
+// Clear deletes all metrics in this vector.
+func (m *metricMap) Clear() {
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
 

prometheus/vec_test.go

@@ -150,7 +150,7 @@ func TestMetricVecWithCollisions(t *testing.T) {
 }
 
 func testMetricVec(t *testing.T, vec *GaugeVec) {
-	vec.Reset() // Actually test Reset now!
+	vec.Clear() // Actually test Clear now!
 
 	var pair [2]string
 	// Keep track of metrics.
@@ -199,7 +199,7 @@ func testMetricVec(t *testing.T, vec *GaugeVec) {
 		t.Fatalf("unexpected number of metrics: %v != %v", total, len(expected))
 	}
 
-	vec.Reset()
+	vec.Clear()
 
 	if len(vec.metricMap.metrics) > 0 {
 		t.Fatalf("reset failed")