Get total time a metric spends at a particular value

[Aniketh Suresh]

Hello,

I'd like to get the total time a metric spends at a particular value.
For example, 

With a gauge, initially set to 0, set the value to 1 when a particular issue arises. I have an alert for when the value > 0. Once the issue is resolved, this gauge goes back to 0.

Now I can use:
floor(changes(issue[10m])/2), to get the number of times I ran into this issue.

Question:

How do I get the total time spend in that state/value? That way I know how long I spend trying to resolve the issue.

Thanks!