in src/main/java/com/googlesource/gerrit/plugins/refprotection/BackupRef.java [185:190]
static String get(ProjectResource project, String refName) {
if (cfg.getFromGerritConfig(pluginName).getBoolean("useTimestamp", true)) {
return getTimestampBranch(refName);
}
return getSequentialBranch(project, refName);
}