Question

A CloudOps engineer supports a serverless order-processing application built on AWS Lambda. The team wants to publish custom business metrics (such as order value and processing duration) from within the Lambda function code without adding synchronous API latency, and they need these metrics to be automatically extracted and queryable in CloudWatch. Which approach best meets these requirements?

Accepted Answer

Write structured logs using the CloudWatch Embedded Metric Format (EMF) to stdout, which CloudWatch automatically parses into metrics from the log data

Answer

Call the CloudWatch PutMetricData API synchronously at the end of each function invocation for every metric

Answer

Install the CloudWatch agent inside the Lambda execution environment to collect and push custom metrics

Answer

Create a CloudWatch metric filter on the Lambda log group and manually define a pattern for each numeric value