bin/metrics-ioping.rb in sensu-plugins-io-checks-2.0.0 vs bin/metrics-ioping.rb in sensu-plugins-io-checks-3.0.0

@@ -1,7 +1,8 @@
 #! /usr/bin/env ruby
-#  encoding: UTF-8
+# frozen_string_literal: true
+
 #
 #   metrics-ioping
 #
 # DESCRIPTION:
 #   Push ioping stats into graphite
@@ -94,22 +95,22 @@
     stats = parse_0_8(str)
     stats = parse_0_6(str) if stats.nil?
     stats
   end
 
-  NUMBER = /\d+(?:\.\d+)?/
-  TIME_UNIT = /(?:ns|us|ms|s|min|hour|day)/
+  NUMBER = /\d+(?:\.\d+)?/.freeze
+  TIME_UNIT = /(?:ns|us|ms|s|min|hour|day)/.freeze
   TIME_UNITS = {
     'ns' => 1e-9,
     'us' => 1e-6,
     'ms' => 1e-3,
     's' => 1,
     'min' => 60,
     'hour' => 60 * 60,
     'day' => 24 * 60 * 60
   }.freeze
   # #YELLOW
-  STATS_HEADER = /min\/avg\/max\/mdev/
+  STATS_HEADER = /min\/avg\/max\/mdev/.freeze
 
   def parse_0_6(str)
     value = /#{NUMBER}/
     sep = /\//
     pattern = /^#{STATS_HEADER} = (#{value})#{sep}(#{value})#{sep}(#{value})#{sep}(#{value}) (#{TIME_UNIT})$/