kafka MetricsContext 源码
kafka MetricsContext 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/metrics/MetricsContext.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.kafka.common.metrics;
import org.apache.kafka.common.annotation.InterfaceStability;
import java.util.Map;
/**
* MetricsContext encapsulates additional contextLabels about metrics exposed via a
* {@link org.apache.kafka.common.metrics.MetricsReporter}
*
* <p>The {@link #contextLabels()} map provides following information:
* <dl>
* <dt>in all components</dt>
* <dd>a {@code _namespace} field indicating the component exposing metrics
* e.g. kafka.server, kafka.consumer.
* The {@link JmxReporter} uses this as prefix for MBean names</dd>
*
* <dt>for clients and streams libraries</dt>
* <dd>any freeform fields passed in via
* client properties in the form of {@code metrics.context.<key>=<value>}</dd>
*
* <dt>for kafka brokers</dt>
* <dd>kafka.broker.id, kafka.cluster.id</dd>
*
* <dt>for connect workers</dt>
* <dd>connect.kafka.cluster.id, connect.group.id</dd>
* </dl>
*/
@InterfaceStability.Evolving
public interface MetricsContext {
/* predefined fields */
String NAMESPACE = "_namespace"; // metrics namespace, formerly jmx prefix
/**
* Returns the labels for this metrics context.
*
* @return the map of label keys and values; never null but possibly empty
*/
Map<String, String> contextLabels();
}
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