With the release of PHP agent version v9.21.0, upon agent upgrade, customers will now have distributed tracing on by default. This eliminates the need to configure the agent in order to have access to distributed traces. Distributed tracing gives software teams working in modern environments an easy way to capture, visualize, and analyze traces through complex architectures, including architectures that use both monoliths and microservices.
What’s the impact?
With this change, New Relic users will see distributed traces immediately upon upgrading to PHP version v9.21.0. Distributed tracing provides more data and better visibility for cross-application requests.
If you don't need this feature, it can be turned off in the PHP agent configuration file by setting
distributed_tracing.enabled=false OR by setting the environment variable