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AWS CloudWatch has Log Groups and Log streams. A log group seems reasonable to me: Each product (e.g. each Lambda function, each Sagemaker endpoint) has its own log group.
But then there are log streams. When does AWS CloudWatch create new log streams? Can I search all log streams of a log group?
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Creates a log stream for the specified log group. A log stream is a sequence of log events that originate from a single source, such as an application instance or a resource that is being monitored. There is no limit on the number of log streams that you can create for a log group.
It may take 5 to 10 minutes for logs to show up after a function invocation.
The CloudWatch Logs Agent will send log data every five seconds by default and is configurable by the user.
To create a log groupOpen the CloudWatch console at https://console.aws.amazon.com/cloudwatch/ . In the navigation pane, choose Log groups. Choose Actions, and then choose Create log group. Enter a name for the log group, and then choose Create log group.
From the AWS Cloudwatch documentation you can see that a log stream is created each time the logs come from a different event source. In case of Lambda, it's one stream per Lambda container where each container might process multiple events.
A log stream is a sequence of log events that share the same source. Each separate source of logs into CloudWatch Logs makes up a separate log stream.
Yes, you can search all log streams of a log group using the CloudWatch Logs API. The FilterLogEvents action allows you to search through a log group.
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