add comment aabout hotspots

098cf7d2 · Pawel Chojnacki · 2b5a639d · 098cf7d2
Commit 098cf7d2 authored Jan 22, 2018 by Pawel Chojnacki
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lib/gitlab/metrics/concern.rb lib/gitlab/metrics/concern.rb +1 -0

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--- a/lib/gitlab/metrics/concern.rb
+++ b/lib/gitlab/metrics/concern.rb
@@ -23,6 +23,7 @@ module Gitlab
          end

          define_singleton_method(name) do
+            # inlining fetch_metric method to avoid method call overhead when instrumenting hot spots
            @@_metrics_provider_cache[name] || init_metric(type, name, opts, &block)
          end
        end