Add comment to clarify system proc stat field

4c6b1fc2 · Ryan Cobb · e9ae881c · 4c6b1fc2
Commit 4c6b1fc2 authored Jun 04, 2019 by Ryan Cobb
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lib/gitlab/metrics/system.rb lib/gitlab/metrics/system.rb +2 -0

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--- a/lib/gitlab/metrics/system.rb
+++ b/lib/gitlab/metrics/system.rb
@@ -35,6 +35,8 @@ module Gitlab
        def self.process_start_time
          fields = File.read('/proc/self/stat').split
+          # fields[21] is linux proc stat field "(22) starttime".
+          # The value is expressed in clock ticks, divide by clock ticks for seconds.
          ( fields[21].to_i || 0 ) / clk_tck
        end
      else