
AWS Certified Advanced Networking – Specialty (ANS-C01) Certification Guide
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To effectively optimize systems, you need to measure their performance, and as you have already learned, this is done with CloudWatch. Basic CloudWatch alerts and actions were discussed in Chapter 2, VPC Traffic and Performance Monitoring. In this section, more advanced CloudWatch features, such as custom metrics and automated alarms, will be detailed. CloudWatch offers a robust suite of monitoring, alerting, and reaction-based responses based on predefined thresholds.
The Advanced Network Specialty certification exam specifically mentions needing to be able to implement custom CloudWatch metrics. It does not, however, mention creating those custom metrics. This is an important distinction.
The details of basic metrics were discussed in Chapter 2, VPC Traffic and Performance Monitoring but custom metrics have several attributes that define what the metric collects and how they perform: