pt EXTEND in the ntor protocol
:var list or_addresses: **\*** alternative for our address/or_port
  attributes, each entry is a tuple of the form (address (**str**), port
  (**int**), is_ipv6 (**bool**))
:var dict protocols: mapping of protocols to their supported versions

**Deprecated**, moved to extra-info descriptor...

:var datetime read_history_end: end of the sampling interval
:var int read_history_interval: seconds per interval
:var list read_history_values: bytes read during each interval

:var datetime write_history_end: end of the sampling interval
:var int write_history_interval: seconds per interval
:var list write_history_values: bytes written during each interval

**\*** attribute is either required when we're parsed with validation or has
a default value, others are left as **None** if undefined

.. versionchanged:: 1.5.0
   Added the allow_tunneled_dir_requests attribute.

.. versionchanged:: 1.6.0
   Added the extra_info_sha256_digest, protocols, and bridge_distribution
   attributes.

.. versionchanged:: 1.7.0
   Added the is_hidden_service_dir attribute.

.. versionchanged:: 1.7.0
   Deprecated the hidden_service_dir field, it's never been populated
   (:spec:`43c2f78`). This field will be removed in Stem 2.0.
r