Exclude exceptions from Sentry by extending the exception

sentry_excluded_exception.rb

require "raven"

module SentryExcludedException; end

Raven.configure do |config|
  config.dsn = "http://public:secret@localhost/project-id"
  # Module extensions to be ignored can't be specified as strings
  config.excluded_exceptions = [SentryExcludedException]
end

Raven.capture do
  begin
    raise StandardError, "oh crap"
  rescue => error
    error.extend SentryExcludedException
    raise
  end
end