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best-practices.md

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Best practices

Retrieving metrics from Amazon CloudWatch:

There are two primary methods for retrieving metrics from Amazon CloudWatch: GetMetricStatistics and GetMetricData. Each method has its own pricing structure, limitations, and recommended use cases.

Method Pricing Limitations Recommendations
GetMetricStatistics Under the free tier, the first 1 million requests are free. Beyond that, there is a charge of $0.01 per 1000requests.

Each sync interval requires five requests. For example, with a sync interval of 300 seconds, you would need 288 requests per day.		 Maximum 1,440 data points can be returned from a single call. If more data points are requested, Amazon CloudWatch returns an error. Use this method during the following scenarios:
  • For initial agent connection
  • When the total data points while re-registering after an agent downtime is less than 1,440.

Data points computation: [(Current time - agent downtime) / (Metrics sync time)]
GetMetricData GetMetricData does not fall under the free tier. It incurs a charge of $0.01 for every 1000 metric requests. Similar to GetMetricStatistics, each sync interval requires five metric requests. Can retrieve up to 100,800 data points in a single operation. Use when the total data points exceed 1,440 while re-registering after agent downtime.
You can also re-register the agent again with GetMetricStatistics, if the free tier is still available (since the datapoints must have decreased).

APIs in Amazon API Gateway

  1. Deleting a REST API in Amazon API Gateway does not delete the API from the runtime (stage) in API Control Plane. However, deleting a stage from a REST API in Amazon API Gateway deletes that API from the runtime (stage) in API Control Plane.

  2. The API name must be unique. If there are two APIs with the same name, API Control Plane aggregates the metrics of both the APIs and generates visualizations and data accordingly.