Thank you Brian. " up to T - 5 minutes ", this 5 mins is the scraping interval?
On Monday, July 25, 2022 at 4:43:33 AM UTC+8 Brian Candler wrote: > The alerting rules run on their own schedule, separately from the scraping > schedule. > > The expression "probe_success == 0" uses the value of that metric in the > prometheus TSDB *at the current instant of time*. However, the value of a > metric at any given time T is the most recent value *on or before* time T > (up to T - 5 minutes). > > On Friday, 22 July 2022 at 05:01:18 UTC+1 [email protected] wrote: > >> Hi dears, >> >> I'm trying to define an alert rule as below, and the scrape and >> evaluation interval are 3m. >> >> >> I checked from log, blackbox will send probe every 2-3second, then the >> metrics will be generated every 2-3second, and the data will be compare >> with the alert rules to dertermine an alert will be triggered or not? >> >> I have a question if Prometheus compares the Live data from blackbox >> probe, or compares the data with Prometheus scrapped in last 3 mins? >> >> prometheus.yml: |- >> global: >> scrape_interval: 3m >> evaluation_interval: 3m >> >> - alert: EndpointDown >> expr: probe_success == 0 >> for: 5s >> labels: >> severity: critical >> annotations: >> description: Service {{ $labels.instance }} is unavailable. >> value: DOWN ({{ $value }}) >> summary: "Endpointdown {{ $labels.instance }} is down." >> > -- 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/a894bd0f-0253-49de-91da-5a28003c0109n%40googlegroups.com.
