New function join_label_sorted()

[D]

Hi All,

I am interested in adding (or having) a new function join_label_sorted() which will be similar to join_label(). It is described as: 

For each timeseries in v, label_join_sorted(v instant-vector, dst_label, string, separator string, src_label1 string, src_label2 string...) joins all the values of all the src_labels using separator and returns the timeseries with the label dst_label contained the joined value such that joined value is concatenation of original values in sorted order. There can be any number of src_labels in this function. 

The following example will return a vector with each time series having a foo label with the value 7_9_12 added to it. 

label_join_sorted(up{job="api-server",src1="12",src2="7",src3="9"}, "foo", "_", "src1", "src2", "src3")

It will help me write alarming rules where I can do group by based on the composite label-value. I am not sure if we can achieve it today using UNLESS clause or so. Let me elaborate with an example to understand why this is a requirement. Let's consider that are two services or devices which are connected as follows:

     A------B 

Suppose the logical/physical connection between A or B goes down, metrics collected from/for each end-point can potentially trigger an alarm. Metric from A will generate an alarm with labels - local node is A and remote node is B. Metric from B will generate an alarm with swapped values. Since the underlying issue could be same, we don't want to generate both the alarms because JIRA fails to de-dup such issues more often than not. 

Thanks,
Dhiman

[Ben Kochie]

Are you sure you're not looking for inhibit rules?

https://prometheus.io/docs/alerting/configuration/#inhibit_rule

This allows one alert to inhibit another alert from firing.

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[Julien Pivotto]

I think alerting on min (up) by (instance,job) == 0 might work too in
this case.

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