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How to calculate percentage of uptime using grafana and prometheus

Currently I am calculating uptime % using below query.

But if I try to test by restarting a service that is if i restart at 11:00 and if i try to test at 11:05 it should show 100% availability, but in my case it is not showing that way.

Please help out with correct calculation for uptime %

Query

avg_over_time(up{instance="$instance", job!="jobid"}[${__range_s}s])*100

I use this query: avg_over_time(availability:max_uptime:percentage{service=~"$applications"}[$__range])

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