On Thu, 13 Jan 2022 at 20:29, Matthias Rampke <[email protected]> wrote:
> Just to check my understanding: I think rules within one group are also > evaluated in order, while groups (even at the same interval) can be > evaluated concurrently. > > If you have multiple rules that build on top of one another (using the > output of one rule in the next) put them in one group, with the most basic > rule first and those that rely on it later. This ensures that each rule > sees current and complete data from those before it. > > On the other hand, if you have several rules that take a while to > evaluate, and independent, put them in separate groups. This allows > Prometheus to take advantage of multiple CPUs and I/O parallelism to make > sure that each group finishes evaluation within its interval. > > Do I remember this correctly? > Yes, that's correct. Brian > > /MR > > On Tue, Jan 11, 2022, 12:00 Brian Candler <[email protected]> wrote: > >> Not much. The main thing is that all rules within a rule group have the >> same evaluation interval; so if you want to have a rule evaluated at a >> different interval, it must be in a different group. >> >> On Tuesday, 11 January 2022 at 04:22:10 UTC [email protected] wrote: >> >>> Hi, >>> >>> can someone please help me understand with what is the difference >>> between using two different groups in rule.yml and using one group with >>> list of two rules? >>> in which situation groups should be preferred and a list of rules in one >>> group? >>> please find below for reference. >>> >>> groups: >>> - name: Spring-boot >>> rules: >>> - alert: response_time_mtr >>> expr: histogram_quantile(.99, >>> sum(rate(http_server_requests_seconds_bucket{uri="<uri>",status="200",appName="app"}[5m])) >>> by (le,appName)) > 2 >>> labels: >>> app_name: app >>> group: Spring-boot >>> annotations: >>> summary: '(instance {{ $labels.instance }})' >>> - name: grp_2 >>> rules: >>> - alert: up_mtr >>> expr: up{job="springapp"} == 0 >>> labels: >>> app_name: app >>> group: grp_2 >>> annotations: >>> summary: "app down alert" >>> >>> ------------------------------------ >>> groups: >>> - name: Spring-boot >>> rules: >>> - alert: response_time_mtr >>> expr: histogram_quantile(.99, >>> sum(rate(http_server_requests_seconds_bucket{uri="<uri>",status="200",appName="app"}[5m])) >>> by (le,appName)) > bool 2 >>> labels: >>> app_name: app >>> annotations: >>> summary: '(instance {{ $labels.instance }})' >>> - alert: up_mtr >>> expr: up{job="springapp"} == 0 >>> labels: >>> app_name: app >>> annotations: >>> summary: "app down alert" >>> 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/4f4d976b-925a-47b4-abe3-23eab9f6a0f5n%40googlegroups.com >> <https://groups.google.com/d/msgid/prometheus-users/4f4d976b-925a-47b4-abe3-23eab9f6a0f5n%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_gZ8z1cwNadwupa23D47%2Bg9auQy6dKRQDHT8YkuY6P1h6A%40mail.gmail.com > <https://groups.google.com/d/msgid/prometheus-users/CAMV%3D_gZ8z1cwNadwupa23D47%2Bg9auQy6dKRQDHT8YkuY6P1h6A%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- Brian Brazil www.robustperception.io -- 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/CAHJKeLrBYmEFWO-LLmf%2BnMQJoswiqRAvA7_YEpeVxgxTfNpGHw%40mail.gmail.com.
