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MOODLE 3.x: Warning: mysql_full_unicode_support The current setup of MySQL or MariaDB is using 'utf8'. This character set does not support four byte characters which include some emoji.
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When checking for correct Unicode, minimum MySQL version is incorrect · Issue #2509 · Cacti/cacti · GitHub
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Illegal mix of collations (utf8mb4_unicode_ci,EXPLICIT) and (utf8_general_ci,COERCIBLE) for operation '<' - Metabase Discussion
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character encoding - MySQL database - conversion of characterset and collation to utf8mb4 and utf8mb4_unicode_ci? - Stack Overflow
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