filter

Filter DSL reference for adapter and collector `filter` fields.

Boolean expressions for filtering metrics by name, source, or labels. A subset of nanook-expr tuned for metric routing rather than thresholding.

Pseudo-fields

Field	What
`name`	metric name (e.g. `cpu.usage`)
`src`	collector name (e.g. `cpu`)
`<key>`	label value (e.g. `core`, `mount`)

Operators

Op	Example
`like`	`name like "cpu.*"` (glob, anchored)
`matches`	`name matches "^cpu\\..*"` (regex, unanchored)
`is`	`name is "cpu.usage"`
`not`	negation prefix: `name not like "*.debug"`
`contains`	`name contains "cpu"`
`&&` `

Examples

# adapter: only cpu and mem metrics
filter = 'name like "cpu.*" || name like "mem.*"'

# adapter: exclude debug metrics
filter = 'name not like "*.debug"'

# collector: only specific interfaces
filter = 'iface like "eth*"'