I would like send a notification to Slack from Service action.

Step to reproduce:

• in Media types -> Slack -> Message templates added Service and Service recovery
• in Service actions created a new action with Send message to users: pager_appl via Slack (user pager_appl has Media Type Slack)

When the action will be triggered the message doesn't arrive on slack due an error

3915222:20221223:103436.207 In am_db_update_alert() alertid:17402 status:2 retries:3 value: error:Slack notification failed : Incorrect "event_source" parameter given: "4". 

And checking on Slack's Media type Script it looks like that event source 4 (I guess for Services) is not handled

https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/media/slack/media_slack.yaml

branch: master

line: 429

            if ([0, 1, 2, 3].indexOf(parseInt(params.event_source)) === -1) {
                throw 'Incorrect "event_source" parameter given: "' + params.event_source + '".\nMust be 0-3.';
            } 

It would be nice that Slack Media type could handle Service actions.