Character plus (+) can't be used in Alerting Rules Label

Document ID : KB000123991
Last Modified Date : 28/12/2018
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Since UVC 6.8.21  it's not possible to create or update an Alerting Rule with a plus sign (+) in the Label .
This was possible in previous versions.
Dollar Universe 6
This problem was introduced by a fix in "Alert rule" menu done in UVC version 6.8.21.
Since that version, the allowed characters do not include the sign "+" anymore: only A-Z0-9_-.[]()@#$ are accepted
It is now possible to create or update an alerting rule with the following authorized characters A-Z0-9_-.[]()@#$+

Update to a fix version listed below or a newer version if available.

Fix version: Dollar Universe 6.9.61
Component: Univiewer.Console
Release Date: 15th January 2019