When closing an issue in GitHub, you can select a "reason" (either "Closing as completed" or "Closing as not planned"), which is currently not readable as a syncable field (see https://guide.unito.io/a-guide-to-unitos-github-integration#syncable-fields). I would expect this to be easily added as a 1-way (read-only) field that could be used to set the resolution on tickets in ex. Jira, since it's available through the GitHub API.