Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.
How label matching works
Use labels and label matchers to link alert rules to notification policies and silences. This allows for a very flexible way to manage your alert instances, specify which policy should handle them, and which alerts to silence.
A label matchers consists of 3 distinct parts, the label, the value and the operator.
The Label field is the name of the label to match. It must exactly match the label name.
The Value field matches against the corresponding value for the specified Label name. How it matches depends on the Operator value.
The Operator field is the operator to match against the label value. The available operators are:
| Operator | Description |
|---|---|
= | Select labels that are exactly equal to the value. |
!= | Select labels that are not equal to the value. |
=~ | Select labels that regex-match the value. |
!~ | Select labels that do not regex-match the value. |
If you are using multiple label matchers, they are combined using the AND logical operator. This means that all matchers must match in order to link a rule to a policy.
Example scenario
If you define the following set of labels for your alert:
{ foo=bar, baz=qux, id=12 }
then:
- A label matcher defined as
foo=barmatches this alert rule. - A label matcher defined as
foo!=bardoes not match this alert rule. - A label matcher defined as
id=~[0-9]+matches this alert rule. - A label matcher defined as
baz!~[0-9]+matches this alert rule. - Two label matchers defined as
foo=barandid=~[0-9]+match this alert rule.
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