Importing Major Release related ticket for 8.1 release in anticipation of raising the bar for 8.2. Release team may close if not needed.The last_lts_mongos_commands.js & last_lts_mongod_commands.js files contain the list of commands added/removed on the router since the last LTS release. Since v8.1 branched out, all commands added in such version can be removed from such lists.