alert condition using: time() not fired

[lethe3000]

Hi, I want to alert if a container which is disappear more than 5s，but I cannot make condition time() - container_last_seen > 5 fired.

ALERT ContainerDown
  IF time() - container_last_seen{name="nginx"} > 5
  FOR 1s
  SUMMARY "container{{$lables.name}} is down on {{$labels.instance}}"
  DESCRIPTION "container{{$labels.name}} down on {{$labels.instance}}"
  RUNBOOK ""

I stopped nginx container, and I executed below query, found that the value is greater than 5.

time() - container_last_seen{name="nginx"}

So I wonder that cannot use time() in alert conditions?

[matthiasr]

No, this should work fine. However, your label values differ – = wants an exact match, and I presume there is no container called "nginx" and thus there is nothing to return.

[lethe3000]

thanks I think I shoud use =~ to match container name.

[lock]

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