Multiplication between two series returns no values

[rmeleromira]

Bug Report

What did you do?

Try to multiply two time series.

What did you expect to see?

The first value multiplied by the second value and then a final value.

What did you see instead? Under which circumstances?

I get no records back, if I hard code the multiplication it works.

Environment

• System information:

root@monitoring:~# uname -srm
Linux 4.4.0-130-generic x86_64

• Prometheus version:

root@monitoring:~# prometheus --version
prometheus, version 2.4.3 (branch: HEAD, revision: 167a4b4e73a8eca8df648d2d2043e21bdb9a7449)
  build user:       root@1e42b46043e9
  build date:       20181004-08:42:02
  go version:       go1.11.1

• Alertmanager version:

root@monitoring:~# alertmanager --version
alertmanager, version 0.15.2 (branch: HEAD, revision: d19fae3bae451940b8470abb680cfdd59bfa7cfa)
  build user:       root@3101e5b68a55
  build date:       20180814-10:53:39
  go version:       go1.10.3

First query

secure_nodes_last_earn{instance="localhost:7980",job="secure_nodes_exporter"}

output

0.0492

Second query

zen_usd_price{instance="localhost:7981",job="secure_nodes_exporter"}

output

13.64

Multiplication

zen_usd_price{instance="localhost:7981",job="secure_nodes_exporter"}*secure_nodes_last_earn{instance="localhost:7980",job="secure_nodes_exporter"}

No results

Hard coding the multiplication works

secure_nodes_last_earn{instance="localhost:7980",job="secure_nodes_exporter"}*13.6

output

0.6691199999999999

[simonpasquier]

Label names need to match on both sides, use ignoring/on to specify on which labels you want to join:

zen_usd_price{instance="localhost:7981",job="secure_nodes_exporter"} * ignoring(instance) secure_nodes_last_earn{instance="localhost:7980",job="secure_nodes_exporter"}

I'm closing it for now. If you have further questions, please use our user mailing list, which you can also search.