Support calculating max rate over time

[bobrik]

What did you do?

I have a metric that is a counter (cpu time). I want to calculate max 5m rate over the last 1d to get the estimate max sustained cpu usage for my thing for capacity planning reasons. Turns out, I can't construct such expression. I can only construct "5m rate over the last 1d" part with:

rate(cadvisor_container_cpu_user_seconds_total{marathon_app_id="/foo/bar"}[5m])

• Prometheus version:

prometheus, version 1.2.1 (branch: master, revision: 05b140e6b2da83e1315518eadd9be7f185adb998)
  build user:       vagrant@53206eae2e4e
  build date:       20161013-14:14:23
  go version:       go1.7.1

[brian-brazil]

You need to create a recording rule for the rate, and then use max_over_time on that.

[bobrik]

@brian-brazil I am probably doing it wrong, but it doesn't make any difference.

Without any rules

Query:

max_over_time(rate(cadvisor_container_cpu_user_seconds_total{marathon_app_id=~"/foo/.+"}[5m]))

Gives:

Error executing query: parse error at char 95: expected type matrix in call to function "max_over_time", got vector

With rule

Used rule:

cadvisor:cpu_user:rate = rate(cadvisor_container_cpu_user_seconds_total{marathon_app_id=~".+"}[3m])

Query with that rule:

max_over_time(cadvisor:cpu_user:rate{marathon_app_id=~"/foo/.+"})

Gives:

Error executing query: parse error at char 66: expected type matrix in call to function "max_over_time", got vector

Even if it should only work with the rule, I think it's worth mentioning that in docs with explanation. It doesn't seem obvious, at least for me.

[mattbostock]

Does the following work?
max_over_time(cadvisor:cpu_user:rate{marathon_app_id=~"/foo/.+"}[5m])

On Sun, 30 Oct 2016, 19:02 Ivan Babrou, notifications@github.com wrote:

@brian-brazil https://github.com/brian-brazil I am probably doing it
wrong, but it doesn't make any difference.
Without any rules

Query:

max_over_time(rate(cadvisor_container_cpu_user_seconds_total{marathon_app_id=~"/foo/.+"}[5m]))

Gives:

Error executing query: parse error at char 95: expected type matrix in call to function "max_over_time", got vector

With rule

Used rule:

cadvisor:cpu_user:rate = rate(cadvisor_container_cpu_user_seconds_total{marathon_app_id=~".+"}[3m])

Query with that rule:

max_over_time(cadvisor:cpu_user:rate{marathon_app_id=~"/foo/.+"})

Gives:

Error executing query: parse error at char 66: expected type matrix in call to function "max_over_time", got vector

Even if it should only work with the rule, I think it's worth mentioning
that in docs with explanation. It doesn't seem obvious, at least for me.

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[bobrik]

@mattbostock that did the trick.

[donghwicha]

Is this still valid? I tried but it fails to gather values
(returns empty values list)

max_over_time(cadvisor:cpu_user:rate{my_cont_id=~"/foo/.+"})

[lock]

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