How much mana has been burned?

Could you please elaborate on the concept of "mana burned" in the context you've mentioned? I'm particularly interested in understanding the significance of this metric and how it's being tracked or measured. Additionally, is there a specific timeframe you're referring to, or is this a cumulative measure? Finally, could you provide some insight into the implications of a high or low amount of mana burned? It would be great if you could keep your response concise yet informative. Thank you.