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+---
+upgrade:
+ - |
+ oslo.db now logs a warning when the connection URL does not
+ explicitly mention a driver. The default driver is still used, but
+ in some cases, such as MySQL, the default is incompatible with the
+ concurrency library eventlet.
+ - |
+ It is strongly recommended to use the `PyMySQL
+ <https://pypi.python.org/pypi/PyMySQL>`__ driver when connecting
+ to a MySQL-compatible database to ensure the best compatibility
+ with the concurrency library eventlet. To use PyMySQL, ensure the
+ connection URL is specified with ``mysql+pymysql://`` as the
+ scheme.