This is a command line utility to export all open issues from a Gitlab installation to a .csv file. The resulting csv contains the title, description, start date, due date (if set on the milestone of the ticket) and current assignee. The description contains a complete history of all comments for the issue and is formatted in Markdown.
You need to have go installed and set up. Install with
go get github.com/b0m0x/gitlab-issue-exporter
Export:
gitlab-issue-exporter --host git.your-organisation.com --token YOUR_GITLAB_PRIVATE_TOKEN --project your-org/your-project
The export is stored in export.csv. The format is compatible with Redmine if Redmine is configured to use markdown.