Merge pull request #21 from ipfs/countervec2

Improve CounterVec abstraction

Author: hsanjuan

Diff for: interface.go

@@ -12,10 +12,11 @@ type Counter interface {
 	Add(float64) // Only positive
 }
 
+type Labels map[string]string
+
 // CounterVec is a counter with tags.
 type CounterVec interface {
-	IncWithLabelValues(labels ...string)
-	AddWithLabelValues(n float64, labels ...string)
+	With(Labels) Counter
 }
 
 // Gauge is a metric that can be increased and decreased.

Diff for: noop.go

@@ -27,12 +27,8 @@ func (g *noop) Observe(v float64) {
 	// Noop
 }
 
-func (g *noop) IncWithLabelValues(labels ...string) {
-	// Noop
-}
-
-func (g *noop) AddWithLabelValues(v float64, labels ...string) {
-	// Noop
+func (g *noop) With(labels Labels) Counter {
+	return g
 }
 
 // Creator functions

Diff for: version.json

@@ -1,3 +1,3 @@
 {
-  "version": "v0.1.0"
+  "version": "v0.2.0"
 }