PromQL: Multiplication by 1 creates additional floating point errors (but should be a no-op) #14052
Description
What did you do?
grafana PromQL:
sum by (le) (increase(ingress_timer_millis_bucket[$__interval]) * on (job, instance) group_left target_info)
What did you expect to see?
The same PromQL response as
sum by (le) (increase(ingress_timer_millis_bucket[$__interval]))
What did you see instead? Under which circumstances?
with the group_left join in place tiny non zeros are sprinkled throughout the buckets at random differing with each repeated request of the same query
System information
No response
Prometheus version
prometheus_build_info{
branch="HEAD",
goarch="amd64",
goos="linux",
goversion="go1.21.6",
instance="0.0.0.0:8080",
revision="43e14844a33b65e2a396e3944272af8b3a494071",
tags="netgo,builtinassets,stringlabels",
version="2.49.1"
}
Prometheus configuration file
No response
Alertmanager version
No response
Alertmanager configuration file
No response
Logs
No response