Key metrics to monitor in telemetry data for cybersecurity purposes include network traffic patterns, system performance metrics, security incidents, threat intelligence data, user behavior anomalies, security posture assessments, data transmission rates, remote monitoring alerts and actionable insights derived from telemetry events. By closely monitoring these metrics, cybersecurity teams can proactively detect and respond to potential threats, enhance the security posture of their networks and leverage telemetry data for effective threat detection and incident response.