Can anyone please explain me: where would I find a log message sent to STDERR?
For instance, in Symfony, in Monolog configuration, I have:

[code]
monolog:
handlers:
main:
type: fingers_crossed
action_level: error
handler: nested
excluded_http_codes: [404, 405]
nested:
type: stream
path: “php://stderr”
level: debug
[/code]

If I want to check logged messages, where would I look?

Thank you