in src/fluent-plugin-mdsd/lib/fluent/plugin/out_mdsd.rb [253:268]
def get_record_values(record)
resultStr = ""
record.each { |key, value|
if resultStr == ""
resultStr << "["
else
resultStr << ","
end
resultStr << get_value_by_type(value)
}
resultStr << "]"
return resultStr
end