在普罗米修斯中找到标签最多的时间序列

Question

Prometheus recommends not using too many labels for timeseries and VictoriaMetrics is even dropping labels if you have more than 30.

But how can I find timeseries that have too many / more than a certain amount of labels? Is that even possible with PromQL?

Answer 1

AFAIK there is no way to measure the number of labels in metrics.

The issue is not the number of labels but the cardinality of the metric . Even if you have 10 labels and 3 of them are constant ( __name__ , job , instance ) and if the 7 others have 2 values each, you reach a cardinality of 128 for a single metric which is already the limit as rule of thumb.

Therefore, it is not something decided a posteriori or monitored but rather decided at design time: the right number of labels is as few as possible.