On 25/01/2021 23:08, [email protected] wrote:
Hell Guys
I have a doubts about using arithmetic operations in Prometheus
Currently I have a metric *A* that return more than a single row with
values, so when I try to divide these values of *A* by using the
single result of another metric *B* I get as result only one row
instead of many row as the first metric *A*, but when I put the value
in hard code, I get the result I want it i.e. many row as the first
metric *A*
*Why is this happening?*
*Thanks for your help in advance *
With many operations Prometheus will match the metrics using their
labels. For your example of A & B, take a look at what combinations of
labels exist - both could be single values or multiple values, both
could have identical sets of labels or different ones. These will all
alter the outcome.
For division by a fixed number there is no problem with label matching,
so for example A / 5 will return exactly as you'd expect, being each of
the values of A (which could be multiple combinations of labels) divided
by 5.
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