Show the Percentage of Users Affected by a Crash in a specific version on Crashlytics

## What feature would you like to see?
I wonder if showing the percentage of users affected by a crash in a specific version is a feasible feature to implement on Crashlytics.
Sometimes is difficult to see if a crash will be an urgent issue because the adoption rate is still low.
Being able to see that would be absolutely awesome!

## How would you use it?
In the day by day, to provide a better crash-free experience to our users.

### Example of use case
1. A new release is uploaded.
2. The release is approved.
3. This version introduces a new crash.
4. We see a new Crashlytics issue that has triggered **X** crash events, affecting to **Y** users to the version **Z** of the app.

But we don't know if **Y** is a small or big number because we don't see if that number is big in comparison with the number of users that have adopted that version at that moment.

Currently, we have to use other tools to be able to see that proportion and that can be tough and probably can be more prone to not detecting an important crash on time.

Let's see this with numbers:
Imagine **Y** is **10 users**.
We can think that a crash affecting to 10 users is not a big deal.
But what happens if this is only **1%** of the total users in the app.
If the version that introduces the crash is on **100%** of the users, that **crash** could be **affecting 1000 users**.

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I hope the idea of the feature is clear enough.
I do think it would be a game changer and a cool companion to the Velocity alerts.

Thank you so much!