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| <h2 title="Class MetricName" class="title">Class MetricName</h2> |
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| <pre>public final class <span class="typeNameLabel">MetricName</span> |
| extends java.lang.Object</pre> |
| <div class="block">The <code>MetricName</code> class encapsulates a metric's name, logical group and its related attributes. It should be constructed using metrics.MetricName(...). |
| <p> |
| This class captures the following parameters |
| <pre> |
| <b>name</b> The name of the metric |
| <b>group</b> logical group name of the metrics to which this metric belongs. |
| <b>description</b> A human-readable description to include in the metric. This is optional. |
| <b>tags</b> additional key/value attributes of the metric. This is optional. |
| </pre> |
| group, tags parameters can be used to create unique metric names while reporting in JMX or any custom reporting. |
| <p> |
| Ex: standard JMX MBean can be constructed like <b>domainName:type=group,key1=val1,key2=val2</b> |
| <p> |
| |
| Usage looks something like this: |
| <pre><code> |
| // set up metrics: |
| |
| Map<String, String> metricTags = new LinkedHashMap<String, String>(); |
| metricTags.put("client-id", "producer-1"); |
| metricTags.put("topic", "topic"); |
| |
| MetricConfig metricConfig = new MetricConfig().tags(metricTags); |
| Metrics metrics = new Metrics(metricConfig); // this is the global repository of metrics and sensors |
| |
| Sensor sensor = metrics.sensor("message-sizes"); |
| |
| MetricName metricName = metrics.metricName("message-size-avg", "producer-metrics", "average message size"); |
| sensor.add(metricName, new Avg()); |
| |
| metricName = metrics.metricName("message-size-max", "producer-metrics"); |
| sensor.add(metricName, new Max()); |
| |
| metricName = metrics.metricName("message-size-min", "producer-metrics", "message minimum size", "client-id", "my-client", "topic", "my-topic"); |
| sensor.add(metricName, new Min()); |
| |
| // as messages are sent we record the sizes |
| sensor.record(messageSize); |
| </code></pre></div> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/kafka/common/MetricName.html#MetricName-java.lang.String-java.lang.String-java.lang.String-java.util.Map-">MetricName</a></span>​(java.lang.String name, |
| java.lang.String group, |
| java.lang.String description, |
| java.util.Map<java.lang.String,java.lang.String> tags)</code></th> |
| <td class="colLast"> |
| <div class="block">Please create MetricName by method <code>Metrics.metricName(String, String, String, Map)</code></div> |
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| <td class="colFirst"><code>java.lang.String</code></td> |
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| <td class="colFirst"><code>int</code></td> |
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| <td class="colFirst"><code>java.lang.String</code></td> |
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| <pre>public MetricName​(java.lang.String name, |
| java.lang.String group, |
| java.lang.String description, |
| java.util.Map<java.lang.String,java.lang.String> tags)</pre> |
| <div class="block">Please create MetricName by method <code>Metrics.metricName(String, String, String, Map)</code></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - The name of the metric</dd> |
| <dd><code>group</code> - logical group name of the metrics to which this metric belongs</dd> |
| <dd><code>description</code> - A human-readable description to include in the metric</dd> |
| <dd><code>tags</code> - additional key/value attributes of the metric</dd> |
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