Get holdout

Get details about a holdout. ### Expanding the holdout response LaunchDarkly supports the following fields for expanding the "Get holdout" response. By default, these fields are **not** included in the response. To expand the response, append the `expand` query parameter and add a comma-separated list with any of the following fields: - `draftIteration` includes the iteration which has not been started yet, if any, for this holdout. - `previousIterations` includes all iterations prior to the current iteration, for this holdout. By default only the current iteration is included in the response. - `rel-draftIteration` includes the iteration which has not been started yet, if any, for the experiments related to this holdout. - `rel-metrics` includes metrics for experiments related to this holdout. - `rel-previousIterations` includes all iterations prior to the current iteration, for the experiments related to this holdout. - `rel-secondaryMetrics` includes secondary metrics for experiments related to this holdout. - `rel-treatments` includes all treatment and parameter details for experiments related to this holdout. - `secondaryMetrics` includes secondary metrics for this holdout. By default only the primary metric is included in the response. - `treatments` includes all treatment and parameter details for this holdout. By default treatment data is not included in the response. For example, `expand=draftIteration,rel-draftIteration` includes the `draftIteration` and `rel-draftIteration` fields in the response. If fields that you request with the `expand` query parameter are empty, they are not included in the response.