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Stan Hu authored
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/50449 refactored `ExportCsvService` to support both issues and requirements. However, it introduced an N+1 SQL query when loading labels of the list of issues that significantly slowed down exporting of many issues. We bring back the memoization for labels inside the `Issues::ExportCsvService` to avoid this. Closes https://gitlab.com/gitlab-org/gitlab/-/issues/321622
ea372fa8
