Hi Ramprasath,
When you do a N-to-1 (or many-to-one) match, you need to ensure that your
matching labels (in your case, "namespace" and "pod") don't produce
multiple matches on the "many" (right) side for any entry on the "one"
(left) side. The error message lists two series from the right side which
have identical namespace + pod labels, but differ on at least the "replica"
label ("thanos-receive-prod-0" vs. "thanos-receive-poc-0"). Maybe you only
wanted to select series from one Thanos receive replica on the right side
and that would fix the issue? Or you could aggregate away the extra label
somehow before applying the binary operator.
Regards,
Julius
On Tue, Jan 26, 2021 at 5:49 AM Ramprasath A <ramprasathaso...@gmail.com>
wrote:
> Hi,
>
> I have an expression of a recording rule named *node:node_num_cpu:sum *and
> I am planning to add this rule to Thanos-Rule component but it fails in
> Thanos-Query itself with the error message: *many-to-many matching not
> allowed: matching labels must be unique on one side* (attached screenshot
> here with too. Please find the attachment.)
>
> Here is the query:
> count by (cluster, node) (sum by (node, cpu) (
> node_cpu_seconds_total{job="node-exporter"}
> * on (namespace, pod) group_left(node)
> node_namespace_pod:kube_pod_info:
> ))
>
> Similarly, there are around about 50 other recording and alerting rules
> which are affected.
>
> Thank you for your time and consideration.
>
> Sincerely,
> Ramprasath A
>
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--
Julius Volz
PromLabs - promlabs.com
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