Vendor main dependencies.

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

@@ -0,0 +1,24 @@
+package metrics
+
+// Counter describes a metric that accumulates values monotonically.
+// An example of a counter is the number of received HTTP requests.
+type Counter interface {
+	With(labelValues ...string) Counter
+	Add(delta float64)
+}
+
+// Gauge describes a metric that takes specific values over time.
+// An example of a gauge is the current depth of a job queue.
+type Gauge interface {
+	With(labelValues ...string) Gauge
+	Set(value float64)
+}
+
+// Histogram describes a metric that takes repeated observations of the same
+// kind of thing, and produces a statistical summary of those observations,
+// typically expressed as quantiles or buckets. An example of a histogram is
+// HTTP request latencies.
+type Histogram interface {
+	With(labelValues ...string) Histogram
+	Observe(value float64)
+}