#' @description
#' **NOTE**: This is an *abstract class*. Abstract classes cannot be instantiated
#' directly, but are exported for package developers that want to extend lgr -
#' for example by creating their own [Appenders][Appender] or [Layouts][Layout].
#' Please refer to the *see also* section for actual implementations of this
#' class.
#'
#' @family abstract classes
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