tag.md

Expression: Tag function

The tag function extracts the value of a specific tag from a metric group.

Syntax

tag ( group **, ** tag )

• group A group name.
• tag A tag identifier.

Example

tag(system.cpu, host)                                            # (1)
tag(com.groupon.requests, 'json endpoint')                       # (2)

1. Extracts the host tag from the metric group system.cpu.
2. Extracts the json endpoint tag from the metric group com.groupon.requests. The tag name was quoted, to allow the space to be encoded.