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Documentation Grafana Alloy Reference Standard library coalesce

coalesce

coalesce takes any number of arguments and returns the first one that isn’t null, an empty string, empty list, or an empty object. It’s useful for obtaining a default value, such as if an environment variable isn’t defined. If no argument is non-empty or non-zero, the last argument is returned.

Examples

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> coalesce("a", "b")
a
> coalesce("", "b")
b
> coalesce(env("DOES_NOT_EXIST"), "c")
c