Hi,
so the list of rules in a group will execute sequentially but it throws an
alert when that particular alert rule condition is met.
example:
groups:
- name: grp1
rules:
- alert: A1
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: A2
expr: up{job="springapp"} == 0
labels:
app_name: app
annotations:
summary: "app down alert"
In the background, A1 is executed first and then A2 rule. but if the A1
condition has not been met, and A2 has met then an alert for A2 is thrown
irrespective of A1. is this correct?
On Fri, Jan 14, 2022 at 2:02 AM Brian Brazil <
[email protected]> wrote:
> 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
>>>>
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>
>
> --
> Brian Brazil
> www.robustperception.io
>
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