In addition to the redesigned logs panel, Symfony 5.4 includes other improvements related to the Symfony profiler.

Conditional profiling

        Contributed by Kévin Dunglas 
        in #43138.

Symfony profiler provides an immense amount of debug information to quickly find the cause of any problem. However, that comes at a price, because the profiler must collect all that information while serving the request. This can slowdown the application even for requests where you don't look at the profiler information (which are most of them). In Symfony 5.4 you can enable the profiler conditionally. To do that, add these two new config options:

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config/packages/dev/web_profiler.yaml

framework: profiler: collect: false collect_parameter: 'profile'

The collect: false option disables the profiler by default and the collect_parameter: profile option enables it for requests that include the profile query parameter. You can freely choose the query parameter name and you can also enable the profiler by submitting a form field with that name (useful for POST requests) and even a request attribute.

More security information in the profiler

        Contributed by Nico Haase
        and Robin Chalas 
        in #42800
        and #42582.

First, the web debug toolbar now shows all the security roles of the logged in user. This way you can quickly check both the roles assigned directly to the user and the roles assigned to them via security roles inheritance:

Second, the security profiler panel includes a new tab called "Authenticators" where you can check the security authenticators that were called during the request:

HTML email preview

        Contributed by Grégoire Pineau 
        in #43751.

The Symfony profiler includes an "Emails" panel where you can inspect the details of the emails sent during the processing of the request. When the email is complex, checking its HTML contents is not practical. In Symfony 5.4 we're improving this panel to also preview the rendered HTML contents of the email:

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https://symfony.com/blog/new-in-symfony-5-4-profiler-improvements?utm_source=Symfony%20Blog%20Feed&utm_medium=feed