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Zorluk: OrtaMonitoring and Analyzing Logs with Amazon CloudWatch

An application deployed on Amazon ECS writes JSON-formatted logs to Amazon CloudWatch Logs. A sample log event is shown below:

{
"statusCode": 500,
"errorType": "DatabaseTimeoutException",
"message": "Connection to database timed out."
}

The developer needs to create a CloudWatch Metric Filter to count the occurrences of this specific database timeout error. Which filter pattern should the developer use to match logs where the statusCode is 500 and the errorType is exactly DatabaseTimeoutException?

  1. { .statusCode = 500 && .errorType = "DatabaseTimeoutException" }Cevap
  2. B
    [statusCode = 500, errorType = "DatabaseTimeoutException"]
  3. C
    { .statusCode == 500 && .errorType == "DatabaseTimeoutException" }
  4. D
    fields statusCode, errorType | filter statusCode = 500 and errorType = "DatabaseTimeoutException"

Cevap

The metric filter pattern { .statusCode = 500 && .errorType = "DatabaseTimeoutException" } correctly filters JSON logs.
The correct metric filter pattern utilizes curly braces to specify a JSON log filter. Inside the braces, JSON properties are referenced using JSONPath-like notation starting with $. representing the root. The equality operator is a single = sign, and the logical combination uses &&.

Adım Adım Çözüm

1
Identify the log format.
The log format is JSON.
Metric filters parse JSON logs differently than space-delimited text logs, requiring curly braces and JSON-path selectors like $. to parse key-value structures.
2
Determine the correct comparison operator and logical operator.
The comparison operator is = and the logical AND operator is &&.
AWS CloudWatch metric filters use a single = for equality checks and && for logical AND conditions.
3
Construct the final filter pattern.
{ .statusCode = 500 && .errorType = "DatabaseTimeoutException" }
This matches both properties in the JSON structure according to CloudWatch Metric Filter syntax specifications.

Anahtar Kavram

CloudWatch Logs Metric Filter JSON Syntax
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Konular

Monitoring and Analyzing Logs with Amazon CloudWatch

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