Please provide a graph over the backlog/pending items

Currently ci.debian.net can show diagrams over pass/fail status of tests in various suites. This is great for getting an overview. However, I feel I am missing an overview of backlog/pending items per architecture/suite.

As an example, I wanted to retry a test (testing migration) but ci.d.n informed me that a retry was already pending. When I found the queued retry, I noted it was almost a week old for that architecture and for another architecture it was getting close to 2 weeks old.

That raised the question, is those pending jobs stuck or are these two architectures flooded by a huge backlog. But I was unable to answer the question by looking at ci.debian.net because all I can get it a list of all the (current) pending jobs - which 1) does not provide an overview and 2) would not give me historical insight to the situation either.

Therefore, I would like a graph over how many items are in the backlog over time. If possible, it would be nice to also have a line of "completed jobs" over time, so it is possible to tell if the backlog grew because processing is stalled or there is a huge influx of new tests.