I know I’m super late to this upgrade, but I’m finally doing it & I have a question that might be a bit silly 
From the Matomo 4.0.0 changelog:
Database tables will now use UTF8 encoding (utf8mb4)… Existing Matomo 3.x databases will need to be converted to utf8 manually.
Our DB is in utf8_general_ci. Will we need to run the conversion tool before upgrading? We’re still in UTF8, just not specifically utf8mb4. My guess is we DO need to convert, but just wanted to see if there was an “obvious answer.”
Thanks!
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