<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def correlate_alert(self, alert, history):
 """ Update alert key attributes, reset duplicate count and set repeat=False, keep track of last receive id and time, appending all to history. Append to history again if status changes. """

        query = {
            'environment': alert.environment,
            'resource': alert.resource,
            '$or': [
                {
                    'event': alert.event,
                    'severity': {'$ne': alert.severity}
                },
                {
                    'event': {'$ne': alert.event},
                    'correlate': alert.event
                }],
            'customer': alert.customer
        }

        update = {
            '$set': {
                'event': alert.event,
                'severity': alert.severity,
                'status': alert.status,
                'service': alert.service,
                'value': alert.value,
                'text': alert.text,
                'createTime': alert.create_time,
                'timeout': alert.timeout,
                'rawData': alert.raw_data,
                'duplicateCount': alert.duplicate_count,
                'repeat': alert.repeat,
                'previousSeverity': alert.previous_severity,
                'trendIndication': alert.trend_indication,
                'receiveTime': alert.receive_time,
                'lastReceiveId': alert.last_receive_id,
                'lastReceiveTime': alert.last_receive_time
            },
            '$addToSet': {'tags': {'$each': alert.tags}},
            '$push': {
                'history': {
                    '$each': [h.serialize for h in history],
                    '$slice': -abs(current_app.config['HISTORY_LIMIT'])
                }
            }
        }

        # only update those attributes that are specifically defined
        attributes = {'attributes.' + k: v for k, v in alert.attributes.items()}
        update['$set'].update(attributes)

        if alert.update_time:
            update['$set']['updateTime'] = alert.update_time

        return self.get_db().alerts.find_one_and_update(
            query,
            update=update,
            return_document=ReturnDocument.AFTER
        )