Sourced from @​aws-lambda-powertools/logger's releases.

v2.31.0

Summary

In this release we are pleased to announce Tracer middleware for the HTTP event handler, which allows users to enable distributed tracing for their HTTP routes with minimal boilerplate code.

In addition, the metric utility now supports a fluent interface, allowing you to chain multiple methods in a single statement.

We have also fixed a bug in the HTTP event handler that caused parameterized headers to be handled incorrectly.

⭐ Special thanks to @​nateiler and @​dothomson for their first PR merged in the project, and to @​arnabrahman! for another great contribution 🎉

Tracer Middleware

You can now use the Tracer utility with the HTTP event handler to gain observability over your routes. The middleware:

• Creates a subsegment for each HTTP route with the format METHOD /path (e.g., GET /users)
• Adds ColdStart and Service annotations
• Optionally captures JSON response bodies as metadata
• Captures errors as metadata when exceptions occur

import { Router } from '@aws-lambda-powertools/event-handler/http';
import { tracer as tracerMiddleware } from '@aws-lambda-powertools/event-handler/http/middleware/tracer';
import { Tracer } from '@aws-lambda-powertools/tracer';
import type { Context } from 'aws-lambda';
const tracer = new Tracer({ serviceName: 'my-api' });
const app = new Router();
app.get(
'/users/cards',
[tracerMiddleware(tracer, { captureResponse: false })],
({ params }) => {
return { id: params.id, secret: 'sensitive-data' };
}
);
export const handler = async (event: unknown, context: Context) =>
app.resolve(event, context);

Metrics Fluent Interface

All mutation methods (with the exception of clear*) now return the metric instance that was mutated, allowing you to chain multiple metrics operations in a single statement.

import { Metrics} from '@aws-lambda-powertools/metrics';
const metrics = new Metrics();
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Sourced from @​aws-lambda-powertools/logger's changelog.

2.31.0 (2026-02-10)

Features

• metrics return metrics instance from metrics functions (#4930) (e7aa2e2)
• parameters pass underlying SDK error as cause to GetParameterError (#4936) (b3499db)
• event-handler add tracer middleware for HTTP routes (#4982) (8be6157)

Bug Fixes

• event-handler handle set-cookie header values with multiple attributes (#4990) (42317fe)
• kafka handle tombstone events (#4991) (04c3236)

• 54d1fa3 chore(ci): bump version to 2.31.0 (#5007)
• 42317fe fix(event-handler): handle set-cookie header values with multiple attributes ...
• 8e4da8a chore(deps): bump @​types/node from 25.2.0 to 25.2.2 (#5004)
• ddf54e0 chore(deps): bump github/codeql-action from 4.32.1 to 4.32.2 (#4998)
• 7692071 chore(deps): bump @​types/node from 25.2.0 to 25.2.1 (#4999)
• d8dfadc chore: manually upgrade dependency tree (#5002)
• 60b6ce1 ci: switch npm auth to OIDC (#4997)
• 04c3236 fix(kafka): handle tombstone events (#4991)
• 8e1359e chore(deps): bump the aws-cdk group across 1 directory with 3 updates (#4985)
• 4c6657a test: extract DF idempotency e2e tests (#4994)
• Additional commits viewable in compare view

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