Issues with more than one ~missed:x.y label is only displayed once in the chart

This was raised by @joshlambert earlier where the list of gitlab-triage10453719 issues in the tracker did not match the number of the charts for gitlab-triage2391246.

https://quality-dashboard.gitlap.com/groups/gitlab-org/teams/monitor

After exporting and looking at it with @markglenfletcher, its due to issues with more than one missed:x.y label.

https://docs.google.com/spreadsheets/d/16m8ZaqNdRYeV-WARfenEwWNSp4HvX_Er5_11NhIXfXs/edit#gid=488279451

https://gitlab.com/groups/gitlab-org/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Monitor&label_name[]=missed%3A11.11

There are 11 issues total but 3 of them have both gitlab-triage10154778 gitlab-triage10453719 one also has gitlab-triage9542583 and gitlab-triage8405114.

https://gitlab.com/groups/gitlab-org/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=Monitor&label_name[]=missed%3A11.10

Its the same case for gitlab-triage10154778. Which totals 9 in the tracker but the 10th issue gitlab-ce#40949 has gitlab-triage9542583 and gitlab-triage~8405114.

Proposal

We need to define the desired behavior in this case.

• Allow double count and display count to all labels.
• If we not double counting, define which version we should pick to display. Either the first version it was missed or the latest.