I would like to ask you if it’s possible to use connection for Slack (Slack app: Get Started | Slack) from our private standalone Gitlab instance. This instance is visible over internet but when I click on “add app” in Slack it always redirects me to sign into Gitlab cloud. Is it possible to connect to our private Gitlab?
I don’t have Slack so I cannot test/check/verify but I know there is an option under Admin Settings → Integrations where Slack can be configured as well as under the projects also.
Choose the channel and then you get a webhook url which you use in your Gitlab configuration. Perhaps if you are doing something else in Slack, this is why it redirects to Gitlab, instead of using the webhook url method.