Context:
see https://confluence.camunda.com/display/CO/2020-07-07+Kick-off%3A+alerts+for+multiple+email+addresses

AT:

• the payload for creating/updating an alert looks like the following:

  {
    name: 'string',
    checkInterval: {
      value: 123
      unit: 'minutes' // Seconds, Minutes, Hours, HalfDays, Days, Weeks, Months
    },
    reportId: 'reportId',
    threshold: 123,
    thresholdOperator: '<' // '>'
    fixNotification: true,
    reminder: {
      value: 123
      unit: 'minutes' // Seconds, Minutes, Hours, HalfDays, Days, Weeks, Months
    },
    emails: ['alerts1@company.org', alerts1@company.org', ...] // or empty. Either email is not empty or webhook must be non null
    webhook: 'someWebhook.com' // or null. Either email is not empty or webhook must be non null
  }
  

• the API docs are adjusted as well
• the migration script adjusts the alerts to the new structure