site uptime calculation

[Alan Miller]

I'm trying to put together a query to show the average uptime of the sites my blackbox exporter is polling.

So there's a metric probe_http_status_code that has the result code (eg. 200) of the probe.

Since BB is polling my sites every minute and I see 1440 values per day

and 40320 per 4weeks

  count_over_time(probe_http_status_code{instance="https://www.mysite.com:443"}[4w]) 

I verified the status code is always 200

    probe_http_status_code{instance="https://www.mysite.com:443"} 

so in theory I should be able to calculate uptime percentage as:

   sum_over_time(metric[4w]) / (200 * count_over_time(metric[4w]))

Why does this query shows uptimes >100%

100 * ((sum_over_time(probe_http_status_code{instance="https://www.mysite.com:443"}[4w]) / (200 * (count_over_time(probe_http_status_code{instance="https://www.mysite.com:443"}[4w])))))

[Ben Kochie]

The `probe_success` metric should be providing a boolean result for the probe. For example the default example of http_2xx probe will make a 0 for non-2xx responses.

Then you can simply do `avg_over_time(probe_success[4w])` to find out your availability.

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