Welcome to the Community!!
As there is no documentation to import the pages from IT Glue to Confluence
You could plan to migrate the documents one by one in testing for all the metadata by exploring the API's for attachments, comments, page revisions, page content in Confluence
API reference here https://developer.atlassian.com/cloud/confluence/rest
Once you are through with that, you can have a script to iterate over the pages in IT Glue to import the pages in Confluence
Reference here for importing pages in Confluence https://confluence.atlassian.com/doc/import-content-into-confluence-191141.html
Thanks,
Pramodh
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