Top Actor Concentration(4.5.2)

How much of the team's activity is driven by the top few contributors. High concentration is a key-person-risk signal; moderate concentration is healthy and reflects natural specialization. The week in progress is not counted: only complete weeks enter this number, so it does not change as the current week fills. Only people's accounts are counted, as Jira reports the account type: apps such as Automation for Jira and service-desk customers are left out, and the number of accounts Jira returned no type for is shown in the sub line.