Stale unscheduled issues requiring attention

Hi triage team (@gitlab-org/triage),

The following issues have been auto-updated by the bot, prompting the author for an update.

Please see the following file for the relevant policies making up this package:

• https://gitlab.com/gitlab-org/quality/triage-ops/blob/5497ec247d386b68e065c013e15dbe29252ecf16/policies/stale-issues.yml

• Control to group Assignee Columns on issue board on demand ~"Plan", boards, ~"feature proposal"

• CE to EE upgrade docs didn't work ~"Documentation", installation

• List merge request by filtering on update_after parameter awaiting feedback

• Service desk with multiple email addresses pre-labeling issues ~"Plan", ~"feature proposal", ~"service desk"

• Calculating stage times and statistics in value stream management ~"Plan", ~"feature proposal"

• Burndown charts never goes to zero ~"Plan", awaiting feedback, issues, milestones

• Add support for charts with multiple series to SLI alerts GitLab Ultimate, ~"Monitoring", ~"feature proposal"

• Delete epic button should stay right aligned on mobile viewports ~"Plan", UX, epics, frontend, ~"portfolio management"

The due date has been set for one week from now. This is to give the author time to respond and update their issue

When this issue is due, we'd like to ask you to:

• Close the referenced issue if it is no longer relevant
• If still valid, follow the normal triage procedure to flag to the relevant team

Thanks for your help!