in src/main/scala/com/googlesource/gerrit/plugins/analytics/common/AggregationStrategy.scala [41:51]
def utc: LocalDateTime = d.toInstant.atZone(ZoneOffset.UTC).toLocalDateTime
}
case class AggregationKey(email: String,
year: Option[Int] = None,
month: Option[Int] = None,
day: Option[Int] = None,
hour: Option[Int] = None,
branch: Option[String] = None)
object EMAIL extends AggregationStrategy {