i have 3 metrics
metrics_1 , metrics_2 , metrics_3 all are of type histogram i want to
write a query that gives the sum of all these metrics filtered by some
label label_1
i have written this expression
*(sum by (label_1)(metrics_1{label_1=~".+"} or vector(0)))+(sum by
(label_1)(metrics_2{label_1=~".+"} or vector(0))) + (sum by
(label_1)(metrics_3{label_1=~".+"} or vector(0)))*
the issue i am facing is suppose metrics_1 is null and other have some
valid data then the whole expression is giving output as zero , what i am
expecting is it should add the other 2 metrics and take metrics_1 as 0 and
give the overall sum.
eg :
metrics_1 = null
metrics_2 = 10
metrics_3 = 14
result = 24 (expected) but actual == 0
i read some blog that suggested to use coalesce ,fillna but both of these
function is supported in my case
any help how can i deal with this ??
or is there any other way i can achieve my goal?
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