[config]logfile to append

[maplestory03]

mode
Mode in which the file is opened; use "w" to truncate or "a" to append (see the built-in open() function)
Default: "w"

    "output":
    {
    ……
        "mode": "a",
   ……
    }

     "logging":
     {
      "mode": "a"
     }

all don't work
where can I set the mode?

[mikf]

In output.logfile:

gallery-dl/docs/gallery-dl-example.conf

Lines 374 to 379 in 4cd9ce8

	"#": "write logging messages to a separate file",
	"logfile": {
	"path": "~/gallery-dl/log.txt",
	"mode": "w",
	"level": "debug"
	},

[maplestory03]

"format": "[{post_id}_{creator['screen_name']}_{post_num}_{num}][{name}][{levelname}] {message}"
{post_id} ,{creator['screen_name']} ……also can't use?
hope to know when warning and error happend what user or page is

[mikf]

Logging messages have only a limited set of replacement fields:

https://gdl-org.github.io/docs/configuration.html#logging-configuration

In addition to the default LogRecord attributes, it is also possible to access the current extractor, job, path, and keywords objects and their attributes, for example "{extractor.url}", "{path.filename}", "{keywords.title}"

You might be able to access metadata values via keywords, e.g. {keywords.post_id}, but they might be None or empty or referring to the previous file.