Python tenacity library retry what does after & retry_error_callback do

Using retry. What does after and retry_error_callback specifically do?

@retry(   stop=stop_after_attempt(3),            wait=wait_exponential(multiplier=3, max=3) + wait_random(0, retry_wait_jitter),            after=logger.error("Error"),            retry_error_callback=logger.error("Error"))