PromQL - vector cannot contain metrics with the same labelset

[Dan S]

Hi,

Not sure what I'm doing wrong when trying to divide

count by (__name__) ({job="kubernetes-pods", app="scylla"})

scrape_series_added{} 70

scrape_samples_scraped{}  70

scylla_node_operation_mode{}  70

scrape_samples_post_metric_relabeling{} 70

scrape_duration_seconds{} 70

up{}  70

When I try to divide by 70 (to find number of time series per pod), I get an error:

count by (__name__) ({job="kubernetes-pods", app="scylla"}) / 70

Error executing query: vector cannot contain metrics with the same labelset

how can I get a basic divide working? so that I end up with something like:

scrape_series_added{} 1

scrape_samples_scraped{}  1

scylla_node_operation_mode{}  1

scrape_samples_post_metric_relabeling{} 1

scrape_duration_seconds{} 1

up{}  1

Basically I want to know exactly how many time series per metric each "app" is generating per pod

Thanks

Dan

[Julius Volz]

Hi,

The problem you're running into is that a binary operator (division, in your case) removes the metric name (because the sample value no longer has that same metric name meaning after the transformation), but the metric name is the only distinguishing label in your case on these series. You could work around that by first copying the metric name to a non-special label, like "metric":

label_join(count by (__name__) ({job="kubernetes-pods", app="scylla"}), "metric", "", "__name__") / 70

Regards,

Julius

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Julius Volz

PromLabs - promlabs.com

[Dan S]

Awesome Julian, thanks!  Works great.