Populate the exhaustion time in the Alerts

[achetronic]

Hello there @metalmatze,

I have seen that the alerts to Alertmanager are not having a description, or a summary. It can be interesting to have deeper data for them just to bring more light to the devs that rely on that information to hurry when the error budget is burning.

IMHO, an interesting approach is populating the exhaustion time for crafting a meaningful message with it, because depending on it, more developers can focus on the problem.

Proposed code is implemented in this PR

[JoSeF267]

hello! i just need these changes too. I think they are necessary to improve the alerts and give a better support. when could it be ready? thanks!

[dr-tomasz]

This is exactly what I need! Hope it will pass 🙏 🚀

[jkrol2]

+1 👍

[achetronic]

Hey @metalmatze 😄 invoking some maintainer here 🙏🏼

[achetronic]

Closing the issue as merged here: #787

Thank you @metalmatze fr reviewing it :)