Try the query interactively (in the expression browser or Grafana's Explore). Strip out parts like the == 0 filter, and the max_over_time, to understand the shape of the data. You may have to vary how exactly you query.
My main point is that you can use the fact that the metric value is a number, and do calculations on it. We often use avg_over_time to alert when (roughly) a certain fraction of probes fails. /MR On Wed, Mar 17, 2021, 18:30 Amit Das <[email protected]> wrote: > Hi Thank you for your reply. > > I tried this querry in alerts as well as as in prometheus dashboard alerts > 9090. > There is no alert fired even though i changed > max_over_time(probe_success{job="abc"}[5m]) == 0 > > other alerts like slow probes etc are firing. I am not sure this the > correct querry i have used. there are instances which are down for more > 24hrs. so in my case i should have a alert fired. > > Does the alert will wait till 24hrs and then fired? > > On Wednesday, March 17, 2021 at 4:25:31 AM UTC+5:30 [email protected] > wrote: > >> Use the fact that it's a number and you can take the maximum of all >> values in the last 24 hours: >> >> max_over_time(probe_success{job="abc"}[24h]) == 0 >> >> No for clause needed in this case. >> >> /MR >> >> On Tue, Mar 16, 2021, 20:59 Amit Das <[email protected]> wrote: >> >>> Hi, >>> I would like to get alerts if my blackbox exporter targets are down for >>> more than 24hrs. >>> >>> I have used >>> "for 24h" >>> which is not correct. I am looking for alert rules >>> >>> probe_sucess=0{job="abc"} > 24h then i should get the alert triggered. >>> >>> Can someone correct the syntax >>> >>> thanks >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Prometheus Users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/prometheus-users/66de0c3d-2ce1-42d6-92b4-6a64137d4950n%40googlegroups.com >>> <https://groups.google.com/d/msgid/prometheus-users/66de0c3d-2ce1-42d6-92b4-6a64137d4950n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "Prometheus Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/prometheus-users/7e6ed385-fcec-402b-a0f4-75816b5ff168n%40googlegroups.com > <https://groups.google.com/d/msgid/prometheus-users/7e6ed385-fcec-402b-a0f4-75816b5ff168n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/CAMV%3D_gbMvkS1LH17t_7BdM29LfYAGV8ZHu0xO%2BaEM75CszKM5g%40mail.gmail.com.
