What I needed is to display the “hostname” in the summary so that I can extract
the hostname on ServiceNow side. Is that possible?
- alert: HostOutOfMemory
annotations:
message: |
Node memory is filling up (< 10% left)
VALUE = {{ $value }}
summary: Host out of memory (instance {{ $labels.instance }}
group_left(nodename) node_uname_info{job="node-exporter-vm”})
expr: node_memory_MemAvailable_bytes {job="node-exporter-vm"} /
node_memory_MemTotal_bytes{job="node-exporter-vm"}
* 100 < 10
for: 5m
labels:
inc: servicenow
severity: warning
> On Sep 1, 2020, at 1:30 PM, Brian Candler <[email protected]> wrote:
>
> 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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