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That isn’t an effective OKR. Try this:

Objective: system downtime must be below .01% every quarter.

KR: implement new fast-response process (binary measurement.)

KR: reduce mean issue resolution time from 60 to 45 minutes (linear measurement of progress with .75 set to 15 minutes and 1.0 set to 20 minutes of reduction)

In this case, your objective is likely a key result of our boss, so it makes sense that it’s the same measurement. You’re being measured on something that matters. One of your key results is purely based on effort. The other might have a bit in it that’s out of your control, but also lets you benefit from other ways you and your team find to achieve the resolution time reduction.