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Documentation: reference/reference_lua/box_info/replication

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	box.info.replication
	The replication section of ``box.info()`` is a table with statistics for all instances in the replica set that the current instance belongs to. To see the example, refer to :ref:`Monitoring a replica set <replication-monitoring>`.
	In the following, n is the index number of one table item, for example, :samp:`replication[1]`, which has data about server instance number 1, which may or may not be the same as the current instance (the "current instance" is what is responding to ``box.info``).
	:samp:`replication[{n}].id` is a short numeric identifier of instance n within the replica set. This value is stored in the :ref:`box.space._cluster <box_space-cluster>` system space.
	:samp:`replication[{n}].uuid` is a globally unique identifier of instance n. This value is stored in the :ref:`box.space._cluster <box_space-cluster>` system space.
	:samp:`replication[{n}].lsn` is the :ref:`log sequence number <replication-mechanism>` (LSN) for the latest entry in instance n's :ref:`write-ahead log <index-box_persistence>` (WAL).
	:samp:`replication[{n}].upstream` appears (is not ``nil``) if the current instance is following or intending to follow instance n, which ordinarily means :samp:`replication[{n}].upstream.status` = ``follow``, :samp:`replication[{n}].upstream.peer` = url of instance n which is being followed, :samp:`replication[{n}].lag and idle` = the instance's speed, described later. Another way to say this is: :samp:`replication[{n}].upstream` will appear when :samp:`replication[{n}].upstream.peer` is not of the current instance, and is not read-only, and was specified in ``box.cfg{replication={...}}``, so it is shown in :ref:`box.cfg.replication <cfg_replication-replication>`.
	:samp:`replication[{n}].upstream.status` is the replication status of the connection with the instance n:
	``connect``: an instance is connecting to the master.
	``auth``: :ref:`authentication <authentication>` is being performed.
	``wait_snapshot``: an instance is receiving metadata from the master. If join fails with a non-critical :ref:`error <error_codes>` at this stage (for example, ``ER_READONLY``, ``ER_ACCESS_DENIED``, or a network-related issue), an instance tries to find a new master to join.
	``fetch_snapshot``: an instance is receiving data from the master's ``.snap`` files.
	``final_join``: an instance is receiving new data added during ``fetch_snapshot``.
	``sync``: the master and replica are synchronizing to have the same data.
	``follow``: the current instance's role is replica. This means that the instance is read-only or acts as a replica for this remote peer in :ref:`master-master <replication-roles>` configuration. The instance is receiving or able to receive data from the instance n's (upstream) master.
	``stopped``: replication is stopped due to a replication error (for example, :ref:`duplicate key <error_codes>`).
	``disconnected``: an instance is not connected to the replica set (for example, due to network issues, not replication errors).

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