private static <T> UnboundJacksonFlag<T> defineJacksonFlag(
            String flagId, T defaultValue, Class<T> jacksonClass,  String description, String modificationEffect, Dimension... dimensions) {
        return Flags.defineJacksonFlag(flagId, defaultValue, jacksonClass, OWNERS, toString(CREATED_AT), toString(EXPIRES_AT), description, modificationEffect, dimensions);
    }
Definition for permanent feature flags

@author bjorncs
flags/src/main/java/com/yahoo/vespa/flags/PermanentFlags.java