09afa64909
This PR was squashed before being merged into the 3.4 branch (closes #24300).
Discussion
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[HttpKernel][FrameworkBundle] Add a minimalist default PSR-3 logger
| Q | A
| ------------- | ---
| Branch? | 3.4
| Bug fix? | no
| New feature? | yes <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks? | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
This PR provides a minimalist PSR-3 logger that is always available when FrameworkBundle is installed.
By default, it writes errors on `stderr`, regular logs on `stdout` and discards debug data (this is configurable).
This approach has several benefits:
- It's what expect from an app logging systems of major containerization and orchestration tools including [Docker](https://docs.docker.com/engine/admin/logging/view_container_logs/) and [Kubernetes](https://kubernetes.io/docs/concepts/cluster-administration/logging/), as well as most cloud providers such as [Heroku](https://devcenter.heroku.com/articles/logging#writing-to-your-log) and [Google Container Engine](https://kubernetes.io/docs/tasks/debug-application-cluster/logging-stackdriver/). If the app follows this standard (and it's not currently the case with Symfony by default) logs will be automatically collected, aggregated and stored.
- It's in sync with the "back to Unix roots" philosophy of Flex
- Logs are directly displayed in the console when running the integrated PHP web server (`bin/console server:start` or Flex's `make serve`), Create React App also do that for instance.
- It fixes a common problem when installing Flex recipes: many bundles expect a logger service but currently there is none available by default, and you usually get a `"logger" service not found error` (because packages depend of the PSR, but the PSR doesn't provide a logger service).
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