Update an experiment. Updating an experiment uses the semantic patch format. To make a semantic patch request, you must append `domain-model=launchdarkly.semanticpatch` to your `Content-Type` header. To learn more, read [Updates using semantic patch](https://launchdarkly.com/docs/api#updates-using-semantic-patch). ### Instructions Semantic patch requests support the following `kind` instructions for updating experiments. #### updateName > **Deprecated**: `updateName` will be removed in a future version. Use `updateExperimentFields` instead. Updates the experiment name. ##### Parameters - `value`: The new name. Here's an example: ```json { "instructions": [{ "kind": "updateName", "value": "Example updated experiment name" }] } ``` #### updateDescription > **Deprecated**: `updateDescription` will be removed in a future version. Use `updateExperimentFields` instead. Updates the experiment description. ##### Parameters - `value`: The new description. Here's an example: ```json { "instructions": [{ "kind": "updateDescription", "value": "Example updated description" }] } ``` #### updateExperimentFields Updates one or more fields on an experiment or its current iteration. Each field update specifies an operation (`add`, `update`, or `remove`) and an optional value. Which fields are mutable depends on the current iteration status. To discover which fields and operations are allowed, expand `mutableFieldsByStatus` on the [Get experiment](https://launchdarkly.com/docs/api/experiments/get-experiment) response. ##### Parameters - `value`: An object mapping field names to field updates. Each field update has the following properties: - `operation`: The operation to perform. One of `add`, `update`, or `remove`. - `value`: The new value for the field. Required for `add` and `update` operations. To find which fields are supported and which operations are allowed for each iteration status, expand `mutableFieldsByStatus` on the [Get experiment](https://launchdarkly.com/docs/api/experiments/get-experiment) response. Here's an example: ```json { "instructions": [{ "kind": "updateExperimentFields", "value": { "name": { "operation": "update", "value": "Updated experiment name" }, "tags": { "operation": "add", "value": ["tag1", "tag2"] } } }] } ``` #### saveAndStartNewIteration Stops the current running iteration, creates a new iteration from it, optionally applies field updates, and starts the new iteration. This is a convenience instruction that combines stopping, updating, and starting in a single operation. ##### Parameters - `changeJustification`: (Optional) The reason for stopping and starting a new iteration. - `value`: (Optional) An object mapping field names to field updates, using the same format as `updateExperimentFields`. These updates are applied to the new iteration before it is started. Here's an example: ```json { "instructions": [{ "kind": "saveAndStartNewIteration", "changeJustification": "Adjusting hypothesis based on early results", "value": { "hypothesis": { "operation": "update", "value": "Updated hypothesis text" } } }] } ``` #### startIteration Starts a new iteration for this experiment. You must [create a new iteration](https://launchdarkly.com/docs/api/experiments/create-iteration) before calling this instruction. An iteration may not be started until it meets the following criteria: * Its associated flag is toggled on and is not archived * Its `randomizationUnit` is set * At least one of its `treatments` has a non-zero `allocationPercent` ##### Parameters - `changeJustification`: The reason for starting a new iteration. Required when you call `startIteration` on an already running experiment, otherwise optional. Here's an example: ```json { "instructions": [{ "kind": "startIteration", "changeJustification": "It's time to start a new iteration" }] } ``` #### stopIteration Stops the current iteration for this experiment. ##### Parameters - `winningTreatmentId`: The ID of the winning treatment. Treatment IDs are returned as part of the [Get experiment](https://launchdarkly.com/docs/api/experiments/get-experiment) response. They are the `_id` of each element in the `treatments` array. - `winningReason`: The reason for the winner Here's an example: ```json { "instructions": [{ "kind": "stopIteration", "winningTreatmentId": "3a548ec2-72ac-4e59-8518-5c24f5609ccf", "winningReason": "Example reason to stop the iteration" }] } ``` #### archiveExperiment Archives this experiment. Archived experiments are hidden by default in the LaunchDarkly user interface. You cannot start new iterations for archived experiments. Here's an example: ```json { "instructions": [{ "kind": "archiveExperiment" }] } ``` #### restoreExperiment Restores an archived experiment. After restoring an experiment, you can start new iterations for it again. Here's an example: ```json { "instructions": [{ "kind": "restoreExperiment" }] } ```