The log_event() and log() methods on opentracing.Span are deprecated and are now implemented using log_kv(). We should do one of the following:

• Verify the two methods work as expected when called on an OT shim instance.
• Decide to drop support for them, note this fact in the documentation and perhaps log a warning in case they are called.

There is a good chance they simply work as-is since the OT shim implements the log_kv() method.