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class="search-icon" tabindex="0"></span><input type="search" id="search_input_react" placeholder="Loading..." aria-label="Search" class="navbar__search-input search-bar" disabled=""></div></div></div></div><div role="presentation" class="navbar-sidebar__backdrop"></div></nav><div id="__docusaurus_skipToContent_fallback" class="main-wrapper mainWrapper_z2l0 docsWrapper_BCFX"><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_sjWU" type="button"></button><div class="docPage__5DB"><main class="docMainContainer_gTbr docMainContainerEnhanced_Uz_u"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Prometheus Emitter</h1></header><p>To use this Apache Druid extension, <a href="/docs/latest/configuration/extensions#loading-extensions">include</a> <code>prometheus-emitter</code> in the extensions load list.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="introduction">Introduction<a href="#introduction" class="hash-link" aria-label="Direct link to Introduction" title="Direct link to Introduction"></a></h2><p>This extension exposes <a href="https://druid.apache.org/docs/latest/operations/metrics.html" target="_blank" rel="noopener noreferrer">Druid metrics</a> for collection by a Prometheus server (<a href="https://prometheus.io/" target="_blank" rel="noopener noreferrer">https://prometheus.io/</a>).</p><p>Emitter is enabled by setting <code>druid.emitter=prometheus</code> <a href="https://druid.apache.org/docs/latest/configuration/index.html#enabling-metrics" target="_blank" rel="noopener noreferrer">configs</a> or include <code>prometheus</code> in the composing emitter list. </p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="configuration">Configuration<a href="#configuration" class="hash-link" aria-label="Direct link to Configuration" title="Direct link to Configuration"></a></h2><p>All the configuration parameters for the Prometheus emitter are under <code>druid.emitter.prometheus</code>.</p><table><thead><tr><th>property</th><th>description</th><th>required?</th><th>default</th></tr></thead><tbody><tr><td><code>druid.emitter.prometheus.strategy</code></td><td>The strategy to expose prometheus metrics. <br>Should be one of <code>exporter</code> and <code>pushgateway</code>. Default strategy <code>exporter</code> would expose metrics for scraping purpose. Peon tasks (short-lived jobs) should use <code>pushgateway</code> strategy.</td><td>yes</td><td>exporter</td></tr><tr><td><code>druid.emitter.prometheus.port</code></td><td>The port on which to expose the prometheus HTTPServer. Required if using <code>exporter</code> strategy.</td><td>no</td><td>none</td></tr><tr><td><code>druid.emitter.prometheus.namespace</code></td><td>Optional metric namespace. Must match the regex <code>[a-zA-Z_:][a-zA-Z0-9_:]*</code></td><td>no</td><td>druid</td></tr><tr><td><code>druid.emitter.prometheus.dimensionMapPath</code></td><td>JSON file defining the Prometheus metric type, desired dimensions, help text, and conversionFactor for every Druid metric.</td><td>no</td><td>Default mapping provided. See below.</td></tr><tr><td><code>druid.emitter.prometheus.addHostAsLabel</code></td><td>Flag to include the hostname as a prometheus label.</td><td>no</td><td>false</td></tr><tr><td><code>druid.emitter.prometheus.addServiceAsLabel</code></td><td>Flag to include the druid service name (e.g. <code>druid/broker</code>, <code>druid/coordinator</code>, etc.) as a prometheus label.</td><td>no</td><td>false</td></tr><tr><td><code>druid.emitter.prometheus.pushGatewayAddress</code></td><td>Pushgateway address. Required if using <code>pushgateway</code> strategy.</td><td>no</td><td>none</td></tr><tr><td><code>druid.emitter.prometheus.flushPeriod</code></td><td>Emit metrics to Pushgateway every <code>flushPeriod</code> seconds. Required if <code>pushgateway</code> strategy is used.</td><td>no</td><td>15</td></tr><tr><td><code>druid.emitter.prometheus.extraLabels</code></td><td>JSON key-value pairs for additional labels on all metrics. Keys (label names) must match the regex <code>[a-zA-Z_:][a-zA-Z0-9_:]*</code>. Example: <code>{"cluster_name": "druid_cluster1", "env": "staging"}</code>.</td><td>no</td><td>none</td></tr></tbody></table><h3 class="anchor anchorWithStickyNavbar_LWe7" id="ports-for-colocated-druid-processes">Ports for colocated Druid processes<a href="#ports-for-colocated-druid-processes" class="hash-link" aria-label="Direct link to Ports for colocated Druid processes" title="Direct link to Ports for colocated Druid processes"></a></h3><p>In certain instances, Druid processes may be colocated on the same host. For example, the Broker and Router may share the same server. Other colocated processes include the Historical and MiddleManager or the Coordinator and Overlord. When you have colocated processes, specify <code>druid.emitter.prometheus.port</code> separately for each process on each host. For example, even if the Broker and Router share the same host, the Broker runtime properties and the Router runtime properties each need to list <code>druid.emitter.prometheus.port</code>, and the port value for both must be different.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="override-properties-for-peon-tasks">Override properties for Peon Tasks<a href="#override-properties-for-peon-tasks" class="hash-link" aria-label="Direct link to Override properties for Peon Tasks" title="Direct link to Override properties for Peon Tasks"></a></h3><p>Peon tasks are created dynamically by middle managers and have dynamic host and port addresses. Since the <code>exporter</code> strategy allows Prometheus to read only from a fixed address, it cannot be used for peon tasks. |
| So, these tasks need to be configured to use <code>pushgateway</code> strategy to push metrics from Druid to prometheus gateway.</p><p>If this emitter is configured to use <code>exporter</code> strategy globally, some of the above configurations need to be overridden in the middle manager so that spawned peon tasks can still use the <code>pushgateway</code> strategy.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">#</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"># Override global prometheus emitter configuration for peon tasks to use `pushgateway` strategy.</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"># Other configurations can also be overridden by adding `druid.indexer.fork.property.` prefix to above configuration properties.</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"># </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.indexer.fork.property.druid.emitter.prometheus.strategy=pushgateway</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">druid.indexer.fork.property.druid.emitter.prometheus.pushGatewayAddress=http://<push-gateway-address></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="metric-names">Metric names<a href="#metric-names" class="hash-link" aria-label="Direct link to Metric names" title="Direct link to Metric names"></a></h3><p>All metric names and labels are reformatted to match Prometheus standards.</p><ul><li>For names: all characters which are not alphanumeric, underscores, or colons (matching <code>[^a-zA-Z_:][^a-zA-Z0-9_:]*</code>) are replaced with <code>_</code></li><li>For labels: all characters which are not alphanumeric or underscores (matching <code>[^a-zA-Z0-9_][^a-zA-Z0-9_]*</code>) are replaced with <code>_</code></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="metric-mapping">Metric mapping<a href="#metric-mapping" class="hash-link" aria-label="Direct link to Metric mapping" title="Direct link to Metric mapping"></a></h3><p>Each metric to be collected by Prometheus must specify a type, one of <code>[timer, counter, guage]</code>. Prometheus Emitter expects this mapping to |
| be provided as a JSON file. Additionally, this mapping specifies which dimensions should be included for each metric. Prometheus expects |
| histogram timers to use Seconds as the base unit. Timers which do not use seconds as a base unit can use the <code>conversionFactor</code> to set |
| the base time unit. If the user does not specify their own JSON file, a default mapping is used. All |
| metrics are expected to be mapped. Metrics which are not mapped will not be tracked.</p><p>Prometheus metric path is organized using the following schema:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"><druid metric name> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"dimensions"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> <dimension list></span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> <timer|counter|gauge></span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"conversionFactor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> <conversionFactor></span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"help"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> <help text></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>For example:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token property">"query/time"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"dimensions"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token string" style="color:rgb(195, 232, 141)">"dataSource"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"type"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"timer"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"conversionFactor"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1000.0</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">"help"</span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"Seconds taken to complete a query."</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>For metrics which are emitted from multiple services with different dimensions, the metric name is prefixed with |
| the service name. For example:</p><div class="language-json codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-json codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token property">"coordinator-segment/count"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> </span><span class="token property">"dimensions"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token string" style="color:rgb(195, 232, 141)">"dataSource"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"gauge"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token property">"historical-segment/count"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"> </span><span class="token property">"dimensions"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">[</span><span class="token string" style="color:rgb(195, 232, 141)">"dataSource"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"tier"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"priority"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">]</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token property">"type"</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"gauge"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>For most use cases, the default mapping is sufficient.</p></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#introduction" class="table-of-contents__link toc-highlight">Introduction</a></li><li><a href="#configuration" class="table-of-contents__link toc-highlight">Configuration</a><ul><li><a href="#ports-for-colocated-druid-processes" class="table-of-contents__link toc-highlight">Ports for colocated Druid processes</a></li><li><a href="#override-properties-for-peon-tasks" class="table-of-contents__link toc-highlight">Override properties for Peon Tasks</a></li><li><a href="#metric-names" class="table-of-contents__link toc-highlight">Metric names</a></li><li><a href="#metric-mapping" class="table-of-contents__link toc-highlight">Metric mapping</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer"><div 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