mutation boardEpicSetSubscription($fullPath: ID!, $iid: ID!, $subscribedState: Boolean!) {
  updateIssuableSubscription: epicSetSubscription(
    input: { groupPath: $fullPath, iid: $iid, subscribedState: $subscribedState }
  ) {
    issuable: epic {
      id
      subscribed
    }
    errors
  }
}
