Count file upload sizes in app

[Manos Seferidis]

I'm new to Prometheus and I'm using it in conjunction with Grafana and Django. Simple metrics are easy enough to make without knowing much.

Now I'm having trouble with collecting data about files being uploaded. In my application the user can upload files up to 50MB so it would be nice
if I could have a graph with the total of each file size. Namely 0.5MB, 1MB, 2MB, 5MB .. 50MB.

I tried using a histogram like below

```python

uploaded_file_sizes = Histogram(

    'uploaded_file_sizes',

    'Uploaded file size in bytes',

    buckets=(

        10000,    #   10KB

        100000,   #   100KB

        500000,   #   500KB

        1000000,  #   1MB

        5000000,  #   5MB

        10000000,  #   10MB

        25000000,  #   25MB

        50000000,  #   50MB

    )

)

```

However I have no idea on how to get a graph that represents the amount of 1MB files uploaded for example. Due to the numbers being cumulative,
this seems a bit hard. Currently I made a fast work-around by showing the below graph

This requires 5 queries for each specific bucket and the graph is still not even intuitive.

How can I avoid this cumulative nature of buckets and instead just show the total files that are closest to a file size (so that no overlapping between buckets occur)?