software.amazon.lambda.powertools.logging

Annotation Type Logging

@Retention(value=RUNTIME)
 @Target(value=METHOD)
public @interface Logging

Logging is used to signal that the annotated method should be extended with Logging functionality.

Logging provides an opinionated logger with output structured as JSON.

Logging should be used with the handleRequest method of a class which implements either com.amazonaws.services.lambda.runtime.RequestHandler or com.amazonaws.services.lambda.runtime.RequestStreamHandler.

By default Logging will load the following keys and values from the Lambda com.amazonaws.services.lambda.runtime.Context

• FunctionName
• FunctionVersion
• InvokedFunctionArn
• MemoryLimitInMB

By default Logging will also create keys for:

• coldStart - True if this is the first invocation of this Lambda execution environment; else False
• service - The value of the 'POWER_TOOLS_SERVICE_NAME' environment variable or 'service_undefined'
• samplingRate - The value of the 'POWERTOOLS_LOGGER_SAMPLE_RATE' environment variable or value of samplingRate field or 0. Valid value is from 0.0 to 1.0. Value outside this range is silently ignored.

These keys and values will be joined with the existing Log4J log event and written as JSON.

The data and time of the log event will be written using DateTimeFormatter.ISO_ZONED_DATE_TIME

By default Logging will not log the event which has trigger the invoke of the Lambda function. This can be enabled using @Logging(logEvent = true).

By default Logging all debug logs will follow log4j2 configuration unless configured via POWERTOOLS_LOGGER_SAMPLE_RATE environment variable @Logging(samplingRate = <0.0-1.0>).

To append additional keys to each log entry you can use LoggingUtils.appendKey(String, String)

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
boolean	logEvent
double	samplingRate

Element Detail

logEvent

public abstract boolean logEvent

Default:

false

samplingRate

public abstract double samplingRate

Default:

0.0