Is it possible to generate graphs of the issues in Grafana? for example, how many issues are pending and / or resolved in a specific project?
If possible, how is it done? we have tried with prometheus but only brings us infrastructure (CPU, Memory, Disk, etc)
You can graph anything in Grafana as long as you have metrics for it.
You can create an application and have prometheus scrape that application, use any of the supported libs that can instrument you app for prometheus and add any custom counters & metrics you want and graph them in Grafana