The Datadog Agent, a widely deployed open-source monitoring tool, has introduced a new feature called "developer mode" to improve its performance and efficiency. This feature provides profiling tools that allow developers to easily profile their code changes before submitting pull requests, reducing unnecessary GitHub conversations. The developer mode includes various metrics such as CPU usage, memory consumption, and network connections, which can be used to identify performance issues in the Agent's code or custom checks. Developers can enable this mode by adding a specific configuration option to the `datadog.conf` file or using the `--profile` command line flag, and the collected data will be available in Datadog under the `datadog.agent.*` namespace. Additionally, developers can contribute their new code or custom checks with profiled data, making it easier to track performance improvements.