Welcome to the Atlassian Community!
I am afraid it is not in Chinese and I do not know if there is a proper translation, but the best place to start is
欢迎来到 Atlassian 社区!
恐怕不是中文的,我不知道是否有合适的翻译,但最好的起点是
https://confluence.atlassian.com/doc/upgrading-confluence-4578.html
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