Moved to google.golang.org/genproto/googleapis/api/annotations

Fixes #52

vendor/github.com/go-kit/kit/metrics/timer.go

@@ -0,0 +1,28 @@
+package metrics
+
+import "time"
+
+// Timer acts as a stopwatch, sending observations to a wrapped histogram.
+// It's a bit of helpful syntax sugar for h.Observe(time.Since(x)).
+type Timer struct {
+	h Histogram
+	t time.Time
+}
+
+// NewTimer wraps the given histogram and records the current time.
+func NewTimer(h Histogram) *Timer {
+	return &Timer{
+		h: h,
+		t: time.Now(),
+	}
+}
+
+// ObserveDuration captures the number of seconds since the timer was
+// constructed, and forwards that observation to the histogram.
+func (t *Timer) ObserveDuration() {
+	d := time.Since(t.t).Seconds()
+	if d < 0 {
+		d = 0
+	}
+	t.h.Observe(d)
+}