You can use Amazon CloudWatch Logs to monitor, store, and access your log
files from EC2 instances, AWS CloudTrail, or other sources. You can then
retrieve the associated log data from CloudWatch Logs using the CloudWatch
console, CloudWatch Logs commands in the AWS CLI, CloudWatch Logs API, or
CloudWatch Logs SDK.
The fields contained in log events found by a GetLogGroupFields
operation, along with the percentage of queried log events in which each
field appears.
Metric filters express how CloudWatch Logs would extract metric observations
from ingested log events and transform them into metric data in a CloudWatch
metric.
Contains the number of log events scanned by the query, the number of log
events that matched the query criteria, and the total number of bytes in the
log events that were scanned.