If an application role uses a new Tarantool feature, it's best not to load it on older Tarantool versions because it may result in confusing failures at runtime. Indeed, a role may check the Tarantool version in the validate() callback, like this:

local tarantool = require('tarantool')
local version = require('version')

return {
    validate = function()
        if version.fromstr(tarantool.version) < version.new(3, 4, 1) then
            error('Cannot run on Tarantool < 3.4.1')
        end
    end,
    apply = function() end,
    stop = function() end,
}

However, it's not really convenient. Also, it generates a confusing error message:

2024-12-25 14:43:39.817 [87390] main utils.c:700 E> LuajitError: Wrong config for role my_role: /tmp/test/my_role.lua:7: Cannot run on Tarantool < 3.4.1

It'd be nice if it a role could specify the minimal supported Tarantool version.

Jira: TNTP-1016