Query SLI using Prometheus's "up" metric

Question

I want to query a server's SLI (such as 99.3%). There's an up Prometheus metric whose value is 1 when the server is up, and either 0 or nonexistent when the server is down. I've tried many queries such as the one shown below but they're not showing the average:

Answer 1

It is likely you need avg_over_time function. For example, the following query returns the average uptime of every scrape target over the last hour:

avg_over_time(up[1h])