On Tuesday, 1 September 2020 21:02:26 UTC+1, Zhang Zhao wrote:
>
> I added the group_left below as highlighted. However, it didn’t work as
> expected in the output. Any advice where was wrong?
> summary: Host out of memory (instance {{ $labels.instance }}
> *group_left(nodename) **node_uname_info{job="node-exporter-vm”}*)
>
>
I don't know what you did, but the entire PromQL expression (including
group_left) goes in the "expr:" part of your alerting rule, not in the
template.
You need to use a binary operator and join on a common label, usually
"instance". Something like:
groups:
- name: UpDown
rules:
- alert: UpDown
expr: (up == 0) * on (instance) group_left(domainname,nodename,sysname)
node_uname_info
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