What does teleporter and armor pack uptime mean?

What does teleporter and armor pack uptime mean? - Unrecognizable couple wearing jeans standing carrying stacked carton boxes out of apartment during renovation on daytime

Currently you can get end-of-match cards that say

"X% teleporter uptime" for Symmetra, and
"X% armor pack uptime" for Torbjorn.

What does "uptime" mean in these cards?

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How to use power armor teleport redux

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Karolina Grabowska, Pixabay, Mike B, Karolina Grabowska