diff --git a/Documentation/api-reference/api.md b/Documentation/api-reference/api.md index 0b224439f..ea9c964e0 100644 --- a/Documentation/api-reference/api.md +++ b/Documentation/api-reference/api.md @@ -11443,8 +11443,9 @@ string (Appears on:RelabelConfig)
LabelName is a valid Prometheus label name which may only contain ASCII -letters, numbers, as well as underscores.
+LabelName is a valid Prometheus label name. +For Prometheus 3.x, a label name is valid if it contains UTF-8 characters. +For Prometheus 2.x, a label name is only valid if it contains ASCII characters, letters, numbers, as well as underscores.