The 2015 State of DevOps Report by Puppet Labs highlights the efficiency of high-performing teams in resolving incidents quickly, emphasizing the importance of effective monitoring systems. As containers become integral to production environments, they require both traditional metrics like CPU and memory usage and container-specific metrics such as CPU and memory limits to optimize performance and scaling decisions. Monitoring strategies must consider application-layer metrics and text-based logs to capture comprehensive insights. Various solutions like Datadog, Prometheus, ELK, and Sysdig offer diverse approaches to monitoring, each with distinct advantages and tradeoffs. While Datadog uses an agent-based approach, Prometheus relies on data scraping, ELK handles both text streams and time-series data, and Sysdig provides cloud-hosted services. The text advises caution when considering building a custom monitoring solution due to the complexity and maintenance involved. Ultimately, a robust monitoring system is crucial for maintaining a secure production environment, requiring continuous experimentation and improvement to adapt to evolving infrastructure needs.