Kapacitor is not able to integrate with slack

Hi All,

we are working on integrating Kapacitor with slack, we are able to connect to the slack app through external API postman applications but the kapacitor throws error while testing.

We are new to TICK, please guide us with this.

Start by reproducing the Kapacitor-to-Slack integration failure described in the issue and inspect the attached screenshot for the reported error. Compare the failing Kapacitor request with the successful external API request; done means the Slack integration can be tested successfully, with the relevant error and reproduction details documented.

Written by the indexing model from the issue text.