Support vectorized counter metric

src/metrics.rs

@@ -4,7 +4,8 @@ use std::net::SocketAddr;
 use tiny_http;
 
 pub use prometheus::{GaugeVec, Histogram, HistogramOpts, HistogramTimer, HistogramVec,
-                     IntCounter as Counter, IntGauge as Gauge, Opts as MetricOpts};
+                     IntCounter as Counter, IntCounterVec as CounterVec, IntGauge as Gauge,
+                     Opts as MetricOpts};
 
 use util::spawn_thread;
 
@@ -27,6 +28,12 @@ impl Metrics {
         c
     }
 
+    pub fn counter_vec(&self, opts: prometheus::Opts, labels: &[&str]) -> CounterVec {
+        let c = CounterVec::new(opts, labels).unwrap();
+        self.reg.register(Box::new(c.clone())).unwrap();
+        c
+    }
+
     pub fn gauge(&self, opts: prometheus::Opts) -> Gauge {
         let g = Gauge::with_opts(opts).unwrap();
         self.reg.register(Box::new(g.clone())).unwrap();