cmd/bosun: prometheus bosun_prefix tag is const
@@ -130,7 +130,7 @@ var Prom = map[string]parse.Func{
}
// promMultiKey is the value for the tag key that is added to multibackend queries.
-var promMultiKey = "bosun_prefix"
+const promMultiKey = "bosun_prefix"
// promGroupTags parses the csv tags argument of the prom based functions
func promGroupTags(args []parse.Node) (parse.Tags, error) {
