private final JsonParser parser; // thread-safe
private final Timer httpMetricsFetchTimer = Metrics.timer(HttpRollupsQueryHandler.class,
"Handle HTTP request for metrics");
public HttpRollupsQueryHandler() {
this.serializer = new JSONBasicRollupsOutputSerializer();
this.gson = new GsonBuilder().setPrettyPrinting().serializeNulls().create();
this.parser = new JsonParser();
}