throttle exceptions (see https://github.com/smartinez87/exception_notification/issues/106)

exception_notification.rb

config.ignore_if do |exception, options|
  # use beginning to prevent non unique keys (they include object ids and such)
  key = exception.message.split("for").first[0..30]
  ExpirableKey.new(key).exist_with_renew
end

expirable_key.rb

class ExpirableKey
  attr_accessor :key, :redis, :expire_in

  def initialize(key, connection: Redis.current, expire_in: 60)
    self.redis = connection
    self.expire_in = expire_in
    self.key = key
  end

  def exist?
    redis.get(key).present?
  end

  def empty?
    not(exist?)
  end

  def exist_with_renew?(value: true)
    result = exist?
    set(value)

    result
  end

  def set(value = true)
    redis.set(key, value)
    redis.expire(key, expire_in) if expire_in.present?
  end
end