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Zorluk: OrtaCloudWatch Logs and Metric Filters

A SysOps Administrator is monitoring a message-processing application that publishes execution logs to an Amazon CloudWatch Logs group. The log events are formatted in JSON as shown in the following example:

{
"queue": "task-worker",
"msg_id": "m-9941",
"duration": 6.2,
"status": "DLQ_REDIRECT"
}

The Administrator wants to extract the message processing duration as a custom CloudWatch metric named `DLQProcessingTime` under the namespace `CustomWorker`, but only for messages that are redirected to the dead-letter queue where the `status` field equals `"DLQ_REDIRECT"`.

Which TWO configuration steps must the Administrator perform to extract this metric?

  1. Create a CloudWatch Logs metric filter with the filter pattern { $.status = "DLQ_REDIRECT" }.Cevap
  2. Configure the metric transformation with a Metric Value of $.duration and Namespace of CustomWorker.Cevap
  3. C
    Set the log retention period of the CloudWatch Logs group to 14 days to enable metric extraction on JSON log streams.
  4. D
    Enable CloudWatch detailed monitoring on the application servers to allow log extraction at 1-minute intervals.
  5. E
    Create an Amazon EventBridge rule that triggers an AWS Systems Manager Automation document to parse the log group stream.

Cevap

The SysOps Administrator must create a CloudWatch Logs metric filter using the JSON filter pattern { .status = "DLQ_REDIRECT" } and configure the metric transformation with a Metric Value of .duration and Namespace of CustomWorker.
To extract a metric from JSON logs, two actions are required: defining the filter pattern to match the target log events and setting up the metric transformation to specify where the metric value comes from. The filter pattern `{ .status = "DLQ_REDIRECT" }` correctly matches only the subset of events that have been redirected. The metric transformation mapping the value to `.duration` successfully extracts the execution duration variable and registers it in the `CustomWorker` namespace.

Adım Adım Çözüm

1
Define a filter pattern to match JSON fields.
Created a filter pattern `{ $.status = "DLQ_REDIRECT" }` that evaluates only logs where the JSON property `status` is equal to the specified string.
This filter filters out unrelated logs so that the metric is only calculated from events redirected to the dead-letter queue.
2
Define the metric transformation rules.
Configured the metric transformation mapping `DLQProcessingTime` as the metric name, `CustomWorker` as the namespace, and `$.duration` as the metric value source.
The metric value source tells CloudWatch Logs which numeric field in the JSON structure represents the metric value to publish.

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CloudWatch Logs Metric Filters with JSON Log Data
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CloudWatch Logs and Metric Filters

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