Atlassian has published a list of sub-processors here: https://www.atlassian.com/legal/sub-processors .
However this list of sub-processors seems not complete. When you use Conflucence, Jira, and other Atlassian sites, data gets transferred to (among others):
- Google (Google fonts, Analytics, Ads)
- Launchdarkly
- Linkedin
- Facebook
- Clicktale
- Vimeo
- Optimizely
- Marketo
- Reddit
- Doubleclick
- Bing
Actually the site listing the sub-processors uses all of the above as of today (Monday, November 21, 2022).