Thank you for the explanation.
> On Sep 1, 2020, at 1:50 PM, Brian Candler <[email protected]> wrote: > > On Tuesday, 1 September 2020 21:42:39 UTC+1, Zhang Zhao wrote: > What I needed is to display the “hostname” in the summary so that I can > extract the hostname on ServiceNow side. Is that possible? > > > The group_left(x,y,z) means that the result gains labels x,y,z from the RHS > expression. So you can use $labels.nodename in the alert template. > > - alert: HostOutOfMemory > annotations: > message: | > Node memory is filling up (< 10% left) > VALUE = {{ $value }} > summary: Host out of memory (instance {{ $labels.instance }} nodename > {{ $labels.nodename }}) > expr: | > (node_memory_MemAvailable_bytes{job="node-exporter-vm"} / > node_memory_MemTotal_bytes{job="node-exporter-vm"} * 100 < 10) > * on(instance) group_left(nodename) node_uname_info > for: 5m > labels: > inc: servicenow > severity: warning > > Another option is to set meaningful "instance" labels at scrape time, so that > $labels.instance can be used directly in the alert without having to do a > join. > https://www.robustperception.io/controlling-the-instance-label > <https://www.robustperception.io/controlling-the-instance-label> > > > -- > You received this message because you are subscribed to the Google Groups > "Prometheus Users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/prometheus-users/524b4c00-910e-4d88-a222-6486a27b1b50o%40googlegroups.com > > <https://groups.google.com/d/msgid/prometheus-users/524b4c00-910e-4d88-a222-6486a27b1b50o%40googlegroups.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "Prometheus Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/prometheus-users/54D68577-64E4-4AB4-AAE0-5D69C09B8764%40gmail.com.
