Configure symfony to see log errors to swiftmailer

If you want 400x and 500x errors, use action_level error, else use action_level critical

monolog:
    handlers:
        main:
            type:         fingers_crossed
            action_level: error
            buffer_size:  200
            handler:      nested
        grouped:
            type: group
            members: [streamed, buffered]
        streamed:
            type:  stream
            path:  %log_dir%/moonlight_%kernel.environment%.log
            level: debug
        buffered:
            type: buffer
            buffer_size:  200
            handler: swift
        swift:
            type:       swift_mailer
            from_email:
            to_email:
            subject:    Crtical Error Alert
            level:      debug