message: Add "Total lag" within Consumer group
diff: @@ -103,6 +103,9 @@ const Details: React.FC = () => {
  <Metrics.Indicator label="Coordinator ID">
  {consumerGroup.coordinator?.id}
  </Metrics.Indicator>
  + <Metrics.Indicator label="Total lag">
  + {consumerGroup.messagesBehind}
  + </Metrics.Indicator>
  </Metrics.Section>
  </Metrics.Wrapper>
  <Table isFullwidth>
  