Apply to specific group, or "all".
Set the log format, undefined will not change the setting.
Set log level, undefined will not change the setting.
Whether to show the logger name, undefined will not change the setting.
Whether to show timestamp, undefined will not change the setting.
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Allows to change the settings for one or all LogGroups. Options will be applied only if set, undefined options are ignored.
The only property really required is group.