message: Unset 'series limit' default from 50 to null
  Setting "Series Limit" by default results in a subquery (or 2 phase)
  which can be suboptimal / unecessary where low cardinality dims
  are used.
diff: @@ -870,8 +870,11 @@ export const controls = {
  label: t('Series limit'),
  validators: [v.integer],
  choices: formatSelectOptions(SERIES_LIMITS),
  - default: 50,
  - description: t('Limits the number of time series that get displayed'),
  + description: t(
  + 'Limits the number of time series that get displayed. A sub query ' +
  + '(or an extra phase where sub queries are not supported) is applied to limit ' +
  + 'the number of time series that get fetched and displayed. This feature is useful ' +
  + 'when grouping by high cardinality dimension(s).'),
  },
  timeseries_limit_metric: {
  