in log4j-api-scala_2.13/src/main/scala/org/apache/logging/log4j/scala/LoggingContext.scala [45:52]
override def -=(elem1: String, elem2: String, elems: String*): LoggingContext.this.type = {
val builder = immutable.Seq.newBuilder[String]
builder += elem1
builder += elem2
builder ++= elems
ThreadContext.removeAll(builder.result.asJava)
this
}