code: def resolve(self, from_email):
          
          if from_email is None or not isinstance(from_email, six.string_types):
              raise MissingFromEmail(from_email)
  
          parent_incident_id = self['incident']['id']
          endpoint_format = 'incidents/{0}/alerts/{1}'
          endpoint = endpoint_format.format(parent_incident_id, self['id'])
  
          add_headers = {'from': from_email, }
          data = {
              'alert': {
                  'id': self['id'],
                  'type': 'alert',
                  'status': 'resolved',
              }
          }
  
          result = self.request('PUT',
                                endpoint=endpoint,
                                add_headers=add_headers,
                                data=data,)
          return result
docs: Resolve an alert using a valid email address.