Removed tracking of total method execution times

CHANGELOG

@@ -43,6 +43,7 @@ v 8.8.0 (unreleased)
   - Fix unintentional filtering bug in issues sorted by milestone due (Takuya Noguchi)
   - Fix adding a todo for private group members (Ahmad Sherif)
   - Bump ace-rails-ap gem version from 2.0.1 to 4.0.2 which upgrades Ace Editor from 1.1.2 to 1.2.3
+  - Total method execution timings are no longer tracked
 
 v 8.7.5
   - Fix relative links in wiki pages. !4050

lib/gitlab/metrics/instrumentation.rb

@@ -154,8 +154,6 @@ module Gitlab
               duration = (Time.now - start) * 1000.0
 
               if duration >= Gitlab::Metrics.method_call_threshold
-                trans.increment(:method_duration, duration)
-
                 trans.add_metric(Gitlab::Metrics::Instrumentation::SERIES,
                                  { duration: duration },
                                  method: #{label.inspect})

spec/lib/gitlab/metrics/instrumentation_spec.rb

@@ -56,9 +56,6 @@ describe Gitlab::Metrics::Instrumentation do
         allow(described_class).to receive(:transaction).
           and_return(transaction)
 
-        expect(transaction).to receive(:increment).
-          with(:method_duration, a_kind_of(Numeric))
-
         expect(transaction).to receive(:add_metric).
           with(described_class::SERIES, an_instance_of(Hash),
                method: 'Dummy.foo')
@@ -139,9 +136,6 @@ describe Gitlab::Metrics::Instrumentation do
         allow(described_class).to receive(:transaction).
           and_return(transaction)
 
-        expect(transaction).to receive(:increment).
-          with(:method_duration, a_kind_of(Numeric))
-
         expect(transaction).to receive(:add_metric).
           with(described_class::SERIES, an_instance_of(Hash),
                method: 'Dummy#bar')