anchor.diff:  <% when "cloudwatch" %>
   gem "aws-sdk-cloudwatchlogs", "~> 1.0"
   <% if is_v1 %>
  -gem "fluent-plugin-cloudwatch-logs", "~> 0.7.3"
  +gem "fluent-plugin-cloudwatch-logs", "~> 0.7.4"
   <% else %>
   gem "fluent-plugin-cloudwatch-logs", "0.4.5"
   <% end %>
  
positive.code: <% end %>
  <% when "gcs" %>
  <% if is_v1 %>
  gem "fluent-plugin-gcs", "0.4.0.beta1"
  <% else %>
  gem "fluent-plugin-gcs", "~> 0.3"
  <% end %>
  
negative.code: source "https://rubygems.org"
  
  gem "fluentd", "<%= fluentd_ver %>"
  gem "oj", "3.8.1"
  gem "fluent-plugin-multi-format-parser", "~> 1.0.0"
  gem "fluent-plugin-concat", "~> 2.3.0"
  gem "fluent-plugin-grok-parser", "~> 2.5.0"
  gem "fluent-plugin-prometheus", "~> 1.5.0"
  gem 'fluent-plugin-json-in-json-2', ">= 1.0.2"
  gem "fluent-plugin-record-modifier", "~> 2.0.0"
  <% if !is_v1 %>
  gem "fluent-plugin-secure-forward"
  gem "fluent-plugin-record-reformer"
  gem "fluent-plugin-rewrite-tag-filter"
  <% else %>
  gem "fluent-plugin-rewrite-tag-filter", "~> 2.2.0"
  <% end %>
  <% case target when "elasticsearch" %>
  <% if is_v1 %>
  