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QuestDB is high performance SQL time series database

There is a newer version: 8.2.1

/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

package io.questdb.metrics;

import io.questdb.std.str.BorrowableUtf8Sink;
import org.jetbrains.annotations.NotNull;

public class NullMetricsRegistry implements MetricsRegistry {

    @Override
    public void addScrapable(Scrapable scrapable) {
    }

    @Override
    public Counter newCounter(CharSequence name) {
        return NullCounter.INSTANCE;
    }

    @Override
    public CounterWithOneLabel newCounter(CharSequence name, CharSequence labelName0, CharSequence[] labelValues0) {
        return NullCounter.INSTANCE;
    }

    @Override
    public CounterWithTwoLabels newCounter(
            CharSequence name,
            CharSequence labelName0,
            CharSequence[] labelValues0,
            CharSequence labelName1,
            CharSequence[] labelValues1
    ) {
        return NullCounter.INSTANCE;
    }

    @Override
    public DoubleGauge newDoubleGauge(CharSequence name) {
        return DoubleGauge.INSTANCE;
    }

    @Override
    public LongGauge newLongGauge(CharSequence name) {
        return NullLongGauge.INSTANCE;
    }

    @Override
    public LongGauge newLongGauge(int memoryTag) {
        return NullLongGauge.INSTANCE;
    }

    @Override
    public LongGauge newVirtualGauge(CharSequence name, VirtualLongGauge.StatProvider provider) {
        return NullLongGauge.INSTANCE;
    }

    @Override
    public void scrapeIntoPrometheus(@NotNull BorrowableUtf8Sink sink) {
    }
}