message: Removing counter from common/metrics/src/op_counters.rs
  Closes:
  Approved by: bmwill
diff: use prometheus::{
  core::{Collector, Desc},
  proto::MetricFamily,
  - Histogram, HistogramOpts, HistogramTimer, HistogramVec, IntCounter, IntCounterVec, IntGauge,
  - IntGaugeVec, Opts,
  + Histogram, HistogramOpts, HistogramTimer, HistogramVec, IntCounterVec, IntGauge, IntGaugeVec,
  + Opts,
  };
  use std::time::Duration;
  @@ -96,11 +96,6 @@ impl OpMetrics {
  self.peer_gauges.with_label_values(&[name, remote_peer_id])
  }
  - #[inline]
  - pub fn counter(&self, name: &str) -> IntCounter {
  - self.counters.with_label_values(&[name])
  - }
  -
  #[inline]
  pub fn histogram(&self, name: &str) -> Histogram {
  self.duration_histograms.with_label_values(&[name])
  