yes. plugin is installed in onPrem APM server already
The Slack channel was set up when the app was on SaaS. The app now moved to onPrem (APM server) . Do we need to create another channel for APM server?
Dynatrace SaaS has built-in integration with Slack and it isnt really the same for AppMon.
I would check if your AppMon server can still connect to the Slack URL and then edit the specific incident actions since you already have the plugin installed.
com.Slack.Chat.action log showing:
2018-08-02 19:46:52 UTC SEVERE [SlackChat@com.Slack.Chat.action] Exception thrown whilst getting output stream...
2018-08-02 19:46:52 UTC SEVERE [SlackChat@com.Slack.Chat.action] java.net.SocketException: Connection reset