Understanding of workload statistics for live and dev


I have difficulties with understanding of workload usage graphs.

Here’s the simplest. Calculating all the columns - it’s 150. With some rounding it seems like this graph sums live and dev usages.

Now we go to workload by activity and here we go

Calculating every number in it will give us 62.05
How does it match to all other values? Is it live? is it dev? I don’t know. It’s x3 of shown dev values, but /2 of live values, so what is it?
Can anyone help me to understand these values?
Because I got ‘spike workload’ alert, but I have no idea how to see it on the graphs to learn the bottlenecks of my app.