Copy MySqlConnector.xml
from this folder to %PROGRAMDATA%\New Relic\.NET Agent\Extensions
.
You must be running New Relic .NET Agent version 8.19.353.0 or later.
See the New Relic documentation for .NET custom transactions and .NET custom instrumentation.
For more information, see this discussion on the New Relic forums.
The instrumentation file was posted by ppavlov.