New Relic Synthetics has introduced a feature called secure credentials to help users manage sensitive data in their scripts, making it easier to update passwords and other sensitive information across multiple scripts with minimal effort. The new feature utilizes key-value pairs and heavy encryption to keep user data safe and secure. With secure credentials, users can easily add and change sensitive data values without having to manually update each individual script. The feature is now available to all New Relic Synthetics users, providing a reduction in manual effort and an increase in security when managing sensitive data.