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<title>Meter receiver | Apache SkyWalking</title><meta property="og:title" content="Meter receiver" />
<meta property="og:description" content="Meter receiver The meter receiver accepts the metrics of meter protocol into the meter system.
Module definition Module definition is defined in application.yml, typically located at $SKYWALKING_BASE_DIR/config/application.yml by default.
receiver-meter:selector:${SW_RECEIVER_METER:default}default:In Kafka Fetcher, follow these configurations to enable it.
kafka-fetcher:selector:${SW_KAFKA_FETCHER:default}default:bootstrapServers:${SW_KAFKA_FETCHER_SERVERS:localhost:9092}Report Meter Telemetry Data Manual Meter API Custom metrics may be collected by the Manual Meter API. Custom metrics collected cannot be used directly; they should be configured in the meter-analyzer-config configuration files described in the next part." />
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<meta itemprop="description" content="Meter receiver The meter receiver accepts the metrics of meter protocol into the meter system.
Module definition Module definition is defined in application.yml, typically located at $SKYWALKING_BASE_DIR/config/application.yml by default.
receiver-meter:selector:${SW_RECEIVER_METER:default}default:In Kafka Fetcher, follow these configurations to enable it.
kafka-fetcher:selector:${SW_KAFKA_FETCHER:default}default:bootstrapServers:${SW_KAFKA_FETCHER_SERVERS:localhost:9092}Report Meter Telemetry Data Manual Meter API Custom metrics may be collected by the Manual Meter API. Custom metrics collected cannot be used directly; they should be configured in the meter-analyzer-config configuration files described in the next part.">
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<meta name="twitter:title" content="Meter receiver"/>
<meta name="twitter:description" content="Meter receiver The meter receiver accepts the metrics of meter protocol into the meter system.
Module definition Module definition is defined in application.yml, typically located at $SKYWALKING_BASE_DIR/config/application.yml by default.
receiver-meter:selector:${SW_RECEIVER_METER:default}default:In Kafka Fetcher, follow these configurations to enable it.
kafka-fetcher:selector:${SW_KAFKA_FETCHER:default}default:bootstrapServers:${SW_KAFKA_FETCHER_SERVERS:localhost:9092}Report Meter Telemetry Data Manual Meter API Custom metrics may be collected by the Manual Meter API. Custom metrics collected cannot be used directly; they should be configured in the meter-analyzer-config configuration files described in the next part."/>
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<h1 id="meter-receiver">Meter receiver</h1>
<p>The meter receiver accepts the metrics
of <a href="https://github.com/apache/skywalking-data-collect-protocol/blob/master/language-agent/Meter.proto">meter protocol</a>
into the <a href="./../../../concepts-and-designs/meter">meter system</a>.</p>
<h2 id="module-definition">Module definition</h2>
<p>Module definition is defined in <code>application.yml</code>, typically located at <code>$SKYWALKING_BASE_DIR/config/application.yml</code> by
default.</p>
<div class="highlight"><pre style="background-color:#fff;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#000080">receiver-meter</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">selector</span>:<span style="color:#bbb"> </span>${SW_RECEIVER_METER:default}<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">default</span>:<span style="color:#bbb">
</span><span style="color:#bbb">
</span></code></pre></div><p>In Kafka Fetcher, follow these configurations to enable it.</p>
<div class="highlight"><pre style="background-color:#fff;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#000080">kafka-fetcher</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">selector</span>:<span style="color:#bbb"> </span>${SW_KAFKA_FETCHER:default}<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">default</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">bootstrapServers</span>:<span style="color:#bbb"> </span>${SW_KAFKA_FETCHER_SERVERS:localhost:9092}<span style="color:#bbb">
</span></code></pre></div><h2 id="report-meter-telemetry-data">Report Meter Telemetry Data</h2>
<h3 id="manual-meter-api">Manual Meter API</h3>
<p>Custom metrics may be collected by the Manual Meter API.
Custom metrics collected cannot be used directly; they should be configured in the <code>meter-analyzer-config</code> configuration
files described in the next part.</p>
<p>The receiver adds labels with <code>key = service</code> and <code>key = instance</code> to the collected data samples,
and values from service and service instance name defined in SkyWalking Agent,
for identification of the metric data.</p>
<p>There are following known API libs to report meter telemetry data:</p>
<ul>
<li><a href="https://skywalking.apache.org/docs/skywalking-java/latest/en/setup/service-agent/java-agent/application-toolkit-meter/">SkyWalking Java Meter toolkit APIs</a></li>
<li><a href="https://skywalking.apache.org/docs/skywalking-java/latest/en/setup/service-agent/java-agent/application-toolkit-micrometer-1.10/">Spring MicroMeter Observations APIs</a>
works with <a href="../micrometer-observations">OAP MicroMeter Observations setup</a></li>
</ul>
<h3 id="agents-bundled-meters">Agents Bundled Meters</h3>
<p>All following agents and components have built-in meters reporting to the OAP through Meter APIs.</p>
<ol>
<li>Go agent for Go VM metrics</li>
<li>Python agent for PVM metrics</li>
<li>Java agent with Spring micrometer toolkit</li>
<li>Java agent for datasource metrics</li>
<li>Java agent for thread-pool metrics</li>
<li>Rover(eBPF) agent for metrics used continues profiling</li>
<li>Satellite proxy self-observability metrics</li>
</ol>
<h2 id="configuration-file">Configuration file</h2>
<p>The meter receiver is configured via a configuration file. The configuration file defines everything related to
receiving
from agents, as well as which rule files to load.</p>
<p>The OAP can load the configuration at bootstrap. If the new configuration is not well-formed, the OAP may fail to start
up. The files
are located at <code>$CLASSPATH/meter-analyzer-config</code>.</p>
<p>New meter-analyzer-config files is <strong>NOT</strong> enabled by default, you should make meter configuration take effect through
section <code>agent-analyzer</code> in <code>application.yml</code> of skywalking backend.</p>
<div class="highlight"><pre style="background-color:#fff;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#bbb"> </span><span style="color:#000080">agent-analyzer</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">selector</span>:<span style="color:#bbb"> </span>${SW_AGENT_ANALYZER:default}<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">default</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#998;font-style:italic"># ... take care of other analyzers</span><span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">meterAnalyzerActiveFiles</span>:<span style="color:#bbb"> </span>${SW_METER_ANALYZER_ACTIVE_FILES:your-custom-meter-conf-without-ext-name}<span style="color:#bbb"> </span><span style="color:#998;font-style:italic"># The multiple files should be separated by &#34;,&#34;</span><span style="color:#bbb">
</span></code></pre></div><p>Meter-analyzer-config file is written in YAML format, defined by the scheme described below. Brackets indicate that a
parameter is optional.</p>
<h3 id="meters-configuration">Meters configuration</h3>
<div class="highlight"><pre style="background-color:#fff;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-yaml" data-lang="yaml"><span style="color:#998;font-style:italic"># initExp is the expression that initializes the current configuration file</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">initExp</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#998;font-style:italic"># filter the metrics, only those metrics that satisfy this condition will be passed into the `metricsRules` below.</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">filter: &lt;closure&gt; # example</span>:<span style="color:#bbb"> </span><span style="color:#d14">&#39;{ tags -&gt; tags.job_name == &#34;vm-monitoring&#34; }&#39;</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#998;font-style:italic"># expPrefix is executed before the metrics executes other functions.</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">expPrefix</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#998;font-style:italic"># expSuffix is appended to all expression in this file.</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">expSuffix</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#998;font-style:italic"># insert metricPrefix into metric name: &lt;metricPrefix&gt;_&lt;raw_metric_name&gt;</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">metricPrefix</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#998;font-style:italic"># Metrics rule allow you to recompute queries.</span><span style="color:#bbb">
</span><span style="color:#bbb"></span><span style="color:#000080">metricsRules</span>:<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#998;font-style:italic"># The name of rule, which combinates with a prefix &#39;&lt;metricPrefix&gt;_&#39; as the index/table name in storage.</span><span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#998;font-style:italic"># The name with prefix can also be quoted in UI (Dashboard/Template/Item/Metrics)</span><span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">name</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#998;font-style:italic"># MAL expression. Raw name of custom metrics collected can be used here</span><span style="color:#bbb">
</span><span style="color:#bbb"> </span><span style="color:#000080">exp</span>:<span style="color:#bbb"> </span>&lt;string&gt;<span style="color:#bbb">
</span></code></pre></div><p>For more information on MAL, please refer to <a href="../../../concepts-and-designs/mal">mal.md</a></p>
<h4 id="rate-irate-and-increase"><code>rate</code>, <code>irate</code>, and <code>increase</code></h4>
<p>Although we support the <code>rate</code>, <code>irate</code>, <code>increase</code> functions in the backend, we still recommend users to consider using
client-side APIs to run these functions. The reasons are as follows:</p>
<ol>
<li>The OAP has to set up caches to calculate the values.</li>
<li>Once the agent reconnects to another OAP instance, the time windows of rate calculation break. This leads to
inaccurate results.</li>
</ol>
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