Grafana can alert off 200 different data sources, most of which do not support PromQL, so it is necessary to offer more features in the client.
On Tuesday 6 February 2024 at 21:18:14 UTC Andrew Dedesko wrote: > That's a good point, Ben and Brian! And thank you both for clarifying! > > On Saturday 3 February 2024 at 11:24:07 UTC-5 Ben Kochie wrote: > >> Yes, that Grafana API seems to be unnecessary complicated compared to >> just using PromQL. >> >> On Sat, Feb 3, 2024, 17:16 'Brian Candler' via Prometheus Users < >> [email protected]> wrote: >> >>> Even without a subquery, a rule can include a range vector expression >>> and then reduce it to an instant vector, e.g. >>> >>> expr: avg_over_time(snmp_scrape_duration_seconds[5m]) >= 3 >>> >>> On Saturday 3 February 2024 at 16:04:56 UTC Ben Kochie wrote: >>> >>>> All rule evaluations are instant queries. You do all the "reducer >>>> functions" in PromQL itself. >>>> >>>> For example, you can use subquery syntax to do something like >>>> `avg_over_time()`. >>>> >>>> On Sat, Feb 3, 2024 at 5:02 PM 'Andrew Dedesko' via Prometheus Users < >>>> [email protected]> wrote: >>>> >>>>> Hi, >>>>> >>>>> I'm wondering whether prometheus uses instant queries or range queries >>>>> when evaluating alert expressions? The context about why I'm asking >>>>> might >>>>> help clarify my question. >>>>> >>>>> I'm comparing Grafana Cloud's alerting functionality with prometheus. >>>>> From Grafana Cloud we're querying Google Cloud Metrics with PromQL (it's >>>>> Google's Monarch DB with a PromQL interface). Grafana Cloud's alerting >>>>> system takes your PromQL query and performs a *range query* against >>>>> Google Cloud Metrics, returning multiple data points over the range you >>>>> have selected (e.g. 10 minutes ago to now). Then you need to choose a >>>>> reducer function to turn the time series into an instant scalar (e.g. >>>>> min, >>>>> max, last, mean). >>>>> >>>>> Prometheus alerts don't seem to have an option for specifying a range >>>>> and also don't have a reducer option. So this leads me to believe >>>>> prometheus uses instant queries to evaluate alert expressions. But I'd >>>>> like to know for sure. >>>>> >>>>> Thanks for reading! >>>>> >>>>> Here's the Grafana Cloud documentation on alert query ranges and >>>>> reducers: >>>>> >>>>> https://grafana.com/docs/grafana/latest/alerting/alerting-rules/create-grafana-managed-rule/ >>>>> >>>>> -- >>>>> 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/ef0e2ee6-a32e-479e-bbe4-10499372715cn%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/prometheus-users/ef0e2ee6-a32e-479e-bbe4-10499372715cn%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/12386cd6-b032-45a6-b755-f0f51551b5d3n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/prometheus-users/12386cd6-b032-45a6-b755-f0f51551b5d3n%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/e154c67a-da46-4075-a40e-b1b65e6c8696n%40googlegroups.com.
