MetricTransformation - Amazon CloudWatch Logs

MetricTransformation

Indicates how to transform ingested log events to metric data in a CloudWatch metric.

Contents

defaultValue

(Optional) The value to emit when a filter pattern does not match a log event. This value can be null.

Type: Double

Required: No

dimensions

The fields to use as dimensions for the metric. One metric filter can include as many as three dimensions.

Important

Metrics extracted from log events are charged as custom metrics. To prevent unexpected high charges, do not specify high-cardinality fields such as IPAddress or requestID as dimensions. Each different value found for a dimension is treated as a separate metric and accrues charges as a separate custom metric.

To help prevent accidental high charges, Amazon disables a metric filter if it generates 1000 different name/value pairs for the dimensions that you have specified within a certain amount of time.

You can also set up a billing alarm to alert you if your charges are higher than expected. For more information, see Creating a Billing Alarm to Monitor Your Estimated AWS Charges.

Type: String to string map

Key Length Constraints: Maximum length of 255.

Value Length Constraints: Maximum length of 255.

Required: No

metricName

The name of the CloudWatch metric.

Type: String

Length Constraints: Maximum length of 255.

Pattern: [^:*$]*

Required: Yes

metricNamespace

A custom namespace to contain your metric in CloudWatch. Use namespaces to group together metrics that are similar. For more information, see Namespaces.

Type: String

Length Constraints: Maximum length of 255.

Pattern: [^:*$]*

Required: Yes

metricValue

The value to publish to the CloudWatch metric when a filter pattern matches a log event.

Type: String

Length Constraints: Maximum length of 100.

Required: Yes

unit

The unit to assign to the metric. If you omit this, the unit is set as None.

Type: String

Valid Values: Seconds | Microseconds | Milliseconds | Bytes | Kilobytes | Megabytes | Gigabytes | Terabytes | Bits | Kilobits | Megabits | Gigabits | Terabits | Percent | Count | Bytes/Second | Kilobytes/Second | Megabytes/Second | Gigabytes/Second | Terabytes/Second | Bits/Second | Kilobits/Second | Megabits/Second | Gigabits/Second | Terabits/Second | Count/Second | None

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: