Welcome to the forums!
I am going to assume perspective but please put tags in your post so you can be better assisted.
Perspective Route:
You are saying time series chart, but I imagine with downtime you will want to display in either a bar chart or in a pie chart.
Below is an example of a state chart I have. This is using Musson Industrial’s Embr-Charts Module but I am just giving as an example.
Are one of these types of charts what you are expecting to see?
It may also be worth giving an example of your data so we can provide better examples and ideas to you.