Alert rule for specific node

[Shruthi P]

Hi I want to write an alert rule for node filesystem device error . But that will show alert if any of the nodes report file system device error. I want it specific for prometheus node.

[Brian Candler]

Every alert rule is just a promQL query.  If that query returns a non-empty set of timeseries, then the alert fires.

If you want the alert only to trigger for a particular node, then include a label matcher that matches only that node. e,g,

expr: node_foo{instance="blah"} > 0