appendKeys.ts

import { Logger } from '@aws-lambda-powertools/logger';

// Add persistent log keys via the constructor
const logger = new Logger({
    persistentLogAttributes: { 
        aws_account_id: '123456789012',
        aws_region: 'eu-west-1',
        logger: {
            name: '@aws-lambda-powertools/logger',
            version: '0.0.1',
        },
        extra_key: "some-value"
    }
});

// OR add persistent log keys to an existing Logger instance with the appendKeys method:
// logger.appendKeys({
//     aws_account_id: '123456789012',
//     aws_region: 'eu-west-1',
//     logger: {
//         name: '@aws-lambda-powertools/logger',
//         version: '0.0.1',
//     },
//     extra_key: "some-value"
// });    

export const handler = async (_event: any, _context: any): Promise<unknown> => {

    // If you don't want to log the "extra_key" attribute in your logs, you can remove it
    logger.removeKeys(["extra_key"])

    // This info log will print all extra custom attributes added above
    // Extra attributes: logger object with name and version of the logger library, awsAccountId, awsRegion
    logger.info('This is an INFO log');
    logger.info('This is another INFO log');
    
    return {
        foo: 'bar'
    };

};