Expire feature flag cache after 1minute

lib/gitlab/metrics/method_call.rb

@@ -80,7 +80,7 @@ module Gitlab
       def call_measurement_enabled?
         expires_at = @@measurement_enabled_cache_expires_at.value
         if expires_at < Time.now.to_i
-          if @@measurement_enabled_cache_expires_at.compare_and_set(expires_at, (Time.now + 30.seconds).to_i)
+          if @@measurement_enabled_cache_expires_at.compare_and_set(expires_at, 1.minute.from_now.to_i)
             @@measurement_enabled_cache.value = Feature.get(:prometheus_metrics_method_instrumentation).enabled?
           end
         end

spec/lib/gitlab/metrics/method_call_spec.rb

@@ -40,15 +40,13 @@ describe Gitlab::Metrics::MethodCall do
         end
 
         it 'expires feature check cache after 30 seconds' do
-          10.times do
+          method_call.measure { 'foo' }
+
+          Timecop.travel(1.minute.from_now) do
             method_call.measure { 'foo' }
           end
 
-          Timecop.travel(Time.now + 30.seconds) do
-            method_call.measure { 'foo' }
-          end
-
-          Timecop.travel(Time.now + 31.seconds) do
+          Timecop.travel(1.minute.from_now + 1.second) do
             method_call.measure { 'foo' }
           end