APM Probes are tools designed to enhance chaos engineering by providing objective measurements of application performance during failure experiments, utilizing existing monitoring systems such as Prometheus, AppDynamics, and Splunk. These probes help establish a baseline for normal application behavior and enable real-time monitoring to assess resilience when introducing variables like network partitions or resource exhaustion. By offering clear pass/fail results based on actual performance data, APM Probes eliminate guesswork, allowing teams to confidently evaluate their systems' ability to handle unexpected issues. Specifically useful in Kubernetes environments, they integrate seamlessly with existing observability infrastructure, making chaos engineering more accessible without the need for additional instrumentation.