Expansion of config:info()

[TarantoolBot]

Related dev. issue(s): tarantool/tarantool#9780

Product: Tarantool
Since: 3.1
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/config/#config-api-reference-info
SME: @ ImeevMA

Details

Before this patch, the meta field of the config:info() function
contained the meta data of the last load, even if it was unsuccessful
reload. This can be inconvenient because if the reload fails, we expect
that the last configuration that was successfully applied is used, but
its metadata was lost.

Now config:info() can take one argument — the version of the
information that should be returned by the function. If no arguments are
specified or the argument is the string v1, the return value has the
same structure as before. If the argument is the string v2, the meta
field in the return value has fields - active (meta for the last
successfully applied configuration) and last (meta of the last loaded
configuration). Currently only these values are accepted.
Requested by @ ImeevMA in tarantool/tarantool@699775b.