message: Removing add from common/metrics/src/op_counters.rs
  Closes:
  Approved by: bmwill
diff: @@ -108,16 +108,6 @@ impl OpMetrics {
  self.counters.with_label_values(&[op]).inc_by(v as i64);
  }
  - #[inline]
  - pub fn add(&self, op: &str) {
  - self.gauges.with_label_values(&[op]).inc();
  - }
  -
  - #[inline]
  - pub fn sub(&self, op: &str) {
  - self.gauges.with_label_values(&[op]).dec();
  - }
  -
  #[inline]
  pub fn set(&self, op: &str, v: usize) {
  // The underlying method is expecting i64, but most of the types
  