We've improved exception message handling for applications running in high security mode. Enabling 'high_security' now removes exception messages entirely rather than simply obfuscating any SQL.
By default this feature affects all exceptions, though you can configure a whitelist of exceptions whose messages should be left intact.
More details: https://newrelic.com/docs/ruby/ruby-agent-configuration
Fix a race condition affecting some Rails applications at startup
Some Rails applications using newrelic_rpm were affected by a race condition at startup that manifested as an error when model classes with associations were first loaded. The cause of these errors has been addressed by moving the generation of the agent's EnvironmentReport on startup from a background thread to the main thread.