Invalid duration in Prometheus rules

[Tom Gregory]

To keep things clean, I want to use the duration format suggested in this article in my Prometheus rule configuration e.g.  1h30m

My complete rule configuration then looks like this:

groups:

  - name: general

    rules:

      - alert: Memory

        expr: sum(jvm_memory_used_bytes{area="heap"}) / sum(jvm_memory_max_bytes{area="heap"}) * 100 > 95

        for: 1h30m

Which produces this error message:

loading groups failed" err="/etc/prometheus/rules.yml: not a valid duration string: \"1h30m\"

When I replace 1h30m with 1h the configuration is accepted. Is this duration formation not allowed in rules?

[Julius Volz]

Hi Tom,

The composite duration syntax got introduced only in 2.21.0. Your config works fine for me with the latest Prometheus version, so you probably just need to upgrade :)

Regards,

Julius

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Julius Volz

PromLabs - promlabs.com

[Tom Gregory]

Many thanks Julius. Checking for an update will be my first port of call next time.

Tom