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Cloud Computing · Intermediate

CloudWatch Logs

CloudWatch capability for collecting, storing, searching and analyzing log data from AWS services, applications and hosts.

Definition

Logs are organized into log groups and streams, with configurable retention and KMS encryption. Metric filters turn log patterns into metrics, subscription filters stream logs to Lambda, Kinesis or OpenSearch, and Logs Insights provides an interactive query language.

Example

A metric filter counts ERROR lines in application logs and an alarm fires when the count exceeds 10 per minute.

Exam tip

Default retention is never expire; set retention policies to control cost.

Related terms