What data visualization would you say is suitable for my purpose? I'm looking for a chart or something similar to present queued items with different states, some is queued, some is processing and some has failed. I have almost 10 different queues, each with three different states.
Right now I have pie charts showing the relation of states in each queue, but this is not good for the comparison between the different queues.
A queue has 10 items total, and if 9 of them has failed it means that 90% of the pie will be red, which will make the user think that something has gone really wrong. But if there is a queue with 100 items and 10 of them is expired, the red area will be significantly smaller than the first queue, and the user will think there is a bigger problem with the first one, although there are a bigger number of failed items in the second queue.
I'm not a fan of the bar chart since it is more of a "information view" than a "monitoring view". Is there any other appropriate approaches?