UI plugin showing slack message header with no way to exclude it.

[pawank94]

Your checklist for this issue

• Jenkins version
  2.190.1

• Plugin version
  2.34

• OS
  RedHat Enterprise Linux

Description
While using Slack notification UI plugin, Message received on slack has a header with information on Job. For example, #5 Mailer job which is sending a Slack message in Post Step of Freestyle job sends a message header like this.

While using slackSend() API from a Pipeline Job doesn't show any such message. This is creating unnecessary inconsistency. There should be a flag to exclude this information when using UI plugin. Specially when there is a custom message declared.

[jetersen]

SlackSend you have to provide the message as it is fully customizable.