MySQL Localhost Error - Localhost VS 127.0.0.1

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Setting “localhost” in the mysql.yaml file may produce this error:

mysql
-----
- instance #0 [ERROR]: OperationalError(2003, 'Can\'t connect to
MySQL server on \'localhost\' ((1045, u"Access denied for user
\'datadog\'@\'127.0.0.1\' (using password: YES)"))')

The workaround is to grant permissions to datadog@127.0.0.1 , rather than datadog@localhost

This problem is documented in this closed Datadog Agent issue and referenced in the MySQL documentation