README.md

The event you want is controller_front_send_response_before, dispatched in Magento\Framework\App\Http::launch() right before the response is flushed. It passes the response object (Magento\Framework\App\Response\Http), and it fires late enough that the redirect status/headers are already set on the response but early enough that the Tideways profiler is still active — so renaming the transaction there takes effect.

Here's the full module. Drop it under app/code/Tideways/TransactionNaming/:

app/code/Tideways/TransactionNaming/
├── registration.php
├── etc/
│   ├── module.xml
│   └── events.xml
└── Observer/
    └── SetRedirectTransactionName.php

A few notes:

The response object is Magento\Framework\App\Response\Http (extends the Laminas/PhpEnvironment response), so getStatusCode() is the canonical accessor. The method_exists guard is just cheap defense in case a controller ever hands back a non-HTTP response type on that event.

Result\Redirect::renderResult() calls setRedirect() which sets the status code via setHttpResponseCode(), so by the time this event fires getStatusCode() reliably returns 301/302. This also catches redirects that don't come from a Result\Redirect — e.g. URL-rewrite 301s — since they end up on the same response object.

Then bin/magento setup:upgrade && bin/magento cache:flush to register it.

One thing worth deciding: at global scope this fires on admin redirects too (lots of 302s after form saves). If you only want storefront redirects grouped under redirect, move events.xml to etc/frontend/.

events.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="controller_front_send_response_before">
        <observer name="tideways_redirect_transaction_name"
                  instance="Tideways\TransactionNaming\Observer\SetRedirectTransactionName"/>
    </event>
</config>

module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Tideways_TransactionNaming"/>
</config>

registration.php

<?php
use Magento\Framework\Component\ComponentRegistrar;

ComponentRegistrar::register(
    ComponentRegistrar::MODULE,
    'Tideways_TransactionNaming',
    __DIR__
);

SetRedirectTransactionName.php

<?php
declare(strict_types=1);

namespace Tideways\TransactionNaming\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class SetRedirectTransactionName implements ObserverInterface
{
    private const REDIRECT_STATUS_CODES = [301, 302];

    public function execute(Observer $observer): void
    {
        $response = $observer->getEvent()->getResponse();

        if ($response === null || !method_exists($response, 'getStatusCode')) {
            return;
        }

        if (!in_array($response->getStatusCode(), self::REDIRECT_STATUS_CODES, true)) {
            return;
        }

        if (class_exists('Tideways\Profiler') && \Tideways\Profiler::getTransactionName() !== null) {
            \Tideways\Profiler::setTransactionName('redirect');
        }
    }
}