This approach is not directly possible in Prometheus itself. Our
recommendation for this case is to use some form of external templating to
reduce repetition in such cases.
However, there is a way using recording rules. You can add a rule for each
route (again, you may want to template that) with the constant value 1:
- record: route_group_1
expr: 1
labels:
route: route1
- record: route_group_1
expr: 1
labels:
route: route2
Then you can reformulate your alert rule to "join" with it:
time() - camel_route_last_exchange_completed_timestamp * on(route)
group_left() route_group_1
this works because the label matching drops all metrics that do not have a
matching route label on the left and right hand side of the "* on(route)".
It does not change the value because we are multiplying by unity.
Whether you consider this more readable is up to you …
/MR
On Tue, Mar 2, 2021, 10:04 'Olaf K' via Prometheus Users <
[email protected]> wrote:
>
> Hi there,
>
> I have already asked this question on Stackoverflow
> <https://stackoverflow.com/questions/66117605/predefined-group-in-prometheus-alerts>,
> but recently found this forum and feel like the question is more suitable
> here.
>
> I have the following query as part of my prometheus alerting rules in my
> rules.yml:
> ...
> - alert: Test1 expr: time() -
> camel_route_last_exchange_completed_timestamp{
> *route="route1|route2|route3...|routex"*}
> for: 10s ...
>
> In short: I am looking for the time since the last time stamp *for
> specific routes*. However, the query is not as important as the part in
> brackets / bold.
>
> I would *prefer to leave out the specific routes* and refer to a *predefined
> group** (e.g. route_group_A = "route1|route2|route3...|routex"})* so that
> the query is readable:
>
> time() - camel_route_last_exchange_completed_timestamp{route="
> *route_group_A*"}
>
> Is this possible? If so, how and in which document to define this?
> I tried using templating, but got no further.
>
> Thanks in advance!
>
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