Hello Siegfried Puchbauer,
Hope you are doing well. I am writing this message to let you know that, we have been using the App "Slack Notification Alert" (https://splunkbase.splunk.com/app/2878/) on our Splunk Enterprise, to page out our operations team members and notify our customers whenever, something goes wrong in our servers or platform.
However, we recently upgraded our Splunk Enterprise Platform from 7.3.3 to 8.0.1 and we no longer are getting paged out on slack and looks like this alert action is no longer supported for 8.0.1. We did reach out to Splunk Support and understood that, this was a developer app and that is the reason why we are reaching out to you.
Kindly help to provide us a solution or an alternative as to what we could utilize as a work around for this application or alert action add on.
Look forward to hearing from you.
Thanks and regards,
Vishwa