hey all could use some assistance creating a Prometheus alert.
It seems simple but after some trial and error its more advanced than i
thought.
We are looking to create alerts for "Link Saturation"
We have dashboards that show us the current bandwidth of the ports, and the
queries look like this:
(
sum by (snmp_target, ifDescr)
(irate(ifHCOutOctets{job_snmp=~"integrations/snmp",
snmp_target=~"$Switches", ifDescr=~"$ifName"}[$__interval])) +
sum by (snmp_target, ifDescr)
(irate(ifHCInOctets{job_snmp=~"integrations/snmp",
snmp_target=~"$Switches", ifDescr=~"$ifName"}[$__interval]))
) * 8
And this query we use in a table to show the Ports Linked Speed:
last_over_time(ifHighSpeed{snmp_target="$Switches"}[$__interval])
So now here begs the question how can i create and alert that basically says
If the Value of (
sum by (snmp_target, ifDescr)
(irate(ifHCOutOctets{job_snmp=~"integrations/snmp",
snmp_target=~"$Switches", ifDescr=~"$ifName"}[$__interval])) +
sum by (snmp_target, ifDescr)
(irate(ifHCInOctets{job_snmp=~"integrations/snmp",
snmp_target=~"$Switches", ifDescr=~"$ifName"}[$__interval]))
) * 8 is Greater than
last_over_time(ifHighSpeed{snmp_target="$Switches"}[$__interval]) fire an
alert
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