Grafana Alloy is the new name for our distribution of the OTel collector. Grafana Agent has been deprecated and is in Long-Term Support (LTS) through October 31, 2025. Grafana Agent will reach an End-of-Life (EOL) on November 1, 2025. Read more about why we recommend migrating to Grafana Alloy.
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Expressions represent or compute values you can assign to attributes within a configuration.

Basic expressions are literal values, like "Hello, world!" or true. Expressions may also do things like refer to values exported by components, perform arithmetic, or call functions.

You use expressions when you configure any component. All component arguments have an underlying type. River checks the expression type before assigning the result to an attribute.