The database collation 'utf8mb4_unicode_ci' and table collation 'utf8mb4_unicode_ci' are not supported by Jira.
My jira software prompted this warning, and I want to know what the problem is. thank you.
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The problem is that your database is set to use an unsupported collation set, exactly as the message says. Have a run through https://confluence.atlassian.com/adminjiraserver073/connecting-jira-applications-to-a-database-861253039.html