depending on your data separation requirements I would suggest you to either have a look to the "Security Schemes", or to create different projects (with different portals).
For the self service aspect, you want to set up a confluence knowledge base and link it to your portal.
Hello, Community! My name is Gosia and I'm a Product Manager on Jira Server and Data Center here at Atlassian. Since 2002 when we launched our public issue tracker, jira.atlass...
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