tools/release/generate_release_notes.rb [54:89]:
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plugin_changes = {}

report <<  "---------- GENERATED CONTENT STARTS HERE ------------"
report <<  "=== Logstash Pull Requests with label v#{current_release}\n"

uri = URI.parse("https://api.github.com/search/issues?q=repo:elastic/logstash+is:pr+is:closed+label:v#{current_release}&sort=created&order=asc")
pull_requests = JSON.parse(Net::HTTP.get(uri))
pull_requests['items'].each do |prs|
  report << "* #{prs['title']} #{prs['html_url']}[##{prs['number']}]"
end
report << ""

report <<  "=== Logstash Commits between #{release_branch} and #{previous_release_tag}\n"
report <<  "Computed with \"git log --pretty=format:'%h -%d %s (%cr) <%an>' --abbrev-commit --date=relative v#{previous_release_tag}..#{release_branch}\""
report <<  ""
logstash_prs = `git log --pretty=format:'%h -%d %s (%cr) <%an>' --abbrev-commit --date=relative v#{previous_release_tag}..#{release_branch}`
report << logstash_prs
report << "\n=== Logstash Plugin Release Changelogs ==="
report << "Computed from \"git diff v#{previous_release_tag}..#{release_branch} *.release\""
result = `git diff v#{previous_release_tag}..#{release_branch} *.release`.split("\n")

result.each do |line|
  # example "+    logstash-input-syslog (3.4.1)"
  if match = line.match(/\+\s+(?<plugin>logstash-.+?-.+?)\s+\((?<version>\d+\.\d+.\d+).*?\)/)
    plugin_changes[match[:plugin]] ||= []
    plugin_changes[match[:plugin]] << match[:version]
  elsif match = line.match(/\-\s+(?<plugin>logstash-.+?-.+?)\s+\((?<version>\d+\.\d+.\d+).*?\)/)
    plugin_changes[match[:plugin]] ||= []
    plugin_changes[match[:plugin]].unshift(match[:version])
  else
    # ..
  end
end
report << "Changed plugin versions:"
plugin_changes.each {|p, v| report << "#{p}: #{v.first} -> #{v.last}" }
report << "---------- GENERATED CONTENT ENDS HERE ------------\n"
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tools/release/generate_release_notes_md.rb [52:87]:
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plugin_changes = {}

report <<  "---------- GENERATED CONTENT STARTS HERE ------------"
report <<  "=== Logstash Pull Requests with label v#{current_release}\n"

uri = URI.parse("https://api.github.com/search/issues?q=repo:elastic/logstash+is:pr+is:closed+label:v#{current_release}&sort=created&order=asc")
pull_requests = JSON.parse(Net::HTTP.get(uri))
pull_requests['items'].each do |prs|
  report << "* #{prs['title']} #{prs['html_url']}[##{prs['number']}]"
end
report << ""

report <<  "=== Logstash Commits between #{release_branch} and #{previous_release_tag}\n"
report <<  "Computed with \"git log --pretty=format:'%h -%d %s (%cr) <%an>' --abbrev-commit --date=relative v#{previous_release_tag}..#{release_branch}\""
report <<  ""
logstash_prs = `git log --pretty=format:'%h -%d %s (%cr) <%an>' --abbrev-commit --date=relative v#{previous_release_tag}..#{release_branch}`
report << logstash_prs
report << "\n=== Logstash Plugin Release Changelogs ==="
report << "Computed from \"git diff v#{previous_release_tag}..#{release_branch} *.release\""
result = `git diff v#{previous_release_tag}..#{release_branch} *.release`.split("\n")

result.each do |line|
  # example "+    logstash-input-syslog (3.4.1)"
  if match = line.match(/\+\s+(?<plugin>logstash-.+?-.+?)\s+\((?<version>\d+\.\d+.\d+).*?\)/)
    plugin_changes[match[:plugin]] ||= []
    plugin_changes[match[:plugin]] << match[:version]
  elsif match = line.match(/\-\s+(?<plugin>logstash-.+?-.+?)\s+\((?<version>\d+\.\d+.\d+).*?\)/)
    plugin_changes[match[:plugin]] ||= []
    plugin_changes[match[:plugin]].unshift(match[:version])
  else
    # ..
  end
end
report << "Changed plugin versions:"
plugin_changes.each {|p, v| report << "#{p}: #{v.first} -> #{v.last}" }
report << "---------- GENERATED CONTENT ENDS HERE ------------\n"
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