sysvar: add 1 var (#10799)#10851

ti-chi-bot merged 2 commits into

pingcap:release-6.1pingcap/docs:release-6.1from

ti-chi-bot:cherry-pick-10799-to-release-6.1ti-chi-bot/docs:cherry-pick-10799-to-release-6.1Copy head branch name to clipboard