Track call counts in Gitlab::Metrics.measure_block

doc/development/instrumentation.md

@@ -14,10 +14,11 @@ Gitlab::Metrics.measure(:foo) do
 end
 ```
 
-Two values are measured for a block:
+3 values are measured for a block:
 
-1. The real time elapsed, stored in NAME_real_time
-2. The CPU time elapsed, stored in NAME_cpu_time
+1. The real time elapsed, stored in NAME_real_time.
+2. The CPU time elapsed, stored in NAME_cpu_time.
+3. The call count, stored in NAME_call_count.
 
 Both the real and CPU timings are measured in milliseconds.
 

lib/gitlab/metrics.rb

@@ -97,6 +97,7 @@ module Gitlab
 
       Transaction.current.increment("#{name}_real_time", real_time)
       Transaction.current.increment("#{name}_cpu_time", cpu_time)
+      Transaction.current.increment("#{name}_call_count", 1)
 
       retval
     end

spec/lib/gitlab/metrics_spec.rb

@@ -85,6 +85,9 @@ describe Gitlab::Metrics do
         expect(transaction).to receive(:increment).
           with('foo_cpu_time', a_kind_of(Numeric))
 
+        expect(transaction).to receive(:increment).
+          with('foo_call_count', 1)
+
         Gitlab::Metrics.measure(:foo) { 10 }
       end