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You can use the parse command along with regular expressions. This allows you to dynamically extract instance IDs from the log events.
Here's an example of how you can achieve this:
fields @timestamp, @message
| parse @message /instance_id:(?<InstanceId>[^\s]+)/
| display InstanceId, @timestamp, @message
In this example: The parse command is used with a regular expression to extract the EC2 instance ID from the @message field. The regular expression /instance_id:(?<InstanceId>[^\s]+)/ captures the value following "instance_id:" until the next whitespace character. The result is stored in the field named InstanceId. Adjust the regular expression based on your log format. This example assumes that the instance ID is followed by a colon and is followed by non-whitespace characters.
The display command is used to show the InstanceId, @timestamp, and @message fields, but you can adjust this based on your requirements.
This way, the query dynamically extracts instance IDs without hard-coding them, allowing you to adapt to different instance IDs in your logs.
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