This is one of the most important sections for the exam - monitoring, audit, and performance.
This note is broken down into the following sections:
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It’s important to know which EC2 metrics or RD metrics or resource metrics to look out for. CloudWatch provides metrics for every services in AWS. - Metric is the variable to monitor - metrics have timestamps - metrics belong to namespaces - basically groups - DImension is an attribute of a metric - you can have up to 10 dimensions per metric - you can create CloudWatch dashboard of metrics
By default, EC2 instance metrics are logged every 5 minutes. You can use Detailed monitoring which collects logs every minute. - faster auto-scaling for ASG - improving scalability - free tier allows up to 10 detailed monitoring metrics - EC2 Memory usage is not pushed by default - must be pushed as custom metric
You cna send your own custom metrics to CloudWatch using CLI or SDK. - can also use attributes(dimensions) to segment metrics - instance ID - environment name - metric resolution: - Standard - 1 minute High Resolution - up to 1 second, higher cost - to send a metric to CloudWatch, you use PutMetricData API - in case of throttle errors, you can use exponential back offs