Yes, OSMessageTracer is safe, but it can also be a privacy concern for some users since it is used by the Apple's OSAnalytics framework to collect that that can improve the quality and functionality of the macOS operating system and the Mac hardware. Apple claims that this data is anonymous and does not contain any personal or sensitive information. However, some users may not want to share it with Apple, or may prefer to have more control over what data is collected and sent from their Mac.