Well, there isn’t such a label because labels have to be created by people going through and adding that label to bugs. So someone has to look through 4000 bugs.
This definitely could be an issue for existing bugs but if it's available when someone creates a bug they could fill it out at that point. Also, the task itself of updating existing tickets with a level of effort required could be done by a new comer as the steps to reproduce and package should allow them to triage the issue and seek out any further information from the reporter better streamlining the investigation process.