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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Whether the metric name survives a binary operation; see `binary_metric_name_side` for the operand that supplies it."><title>binary_keeps_metric_name in servers::http::prometheus - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-1ed95124.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="servers" data-themes="" data-resource-suffix="" data-rustdoc-version="1.98.1 (48a229cea 2026-09-01)" data-channel="1.98.1" data-search-js="search-9944d736.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../static.files/storage-41dd4d93.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-417ebf0a.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">binary_keeps_metric_name</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../servers/index.html">servers</a><span class="version">1.4.0-alpha.0</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In servers::<wbr>http::<wbr>prometheus</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../../index.html">servers</a>::<wbr><a href="../index.html">http</a>::<wbr><a href="index.html">prometheus</a></div><h1>Function <span class="fn">binary_<wbr>keeps_<wbr>metric_<wbr>name</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/servers/http/prometheus.rs.html#1391-1425">Source</a> </span></div><pre class="rust item-decl"><code>fn binary_keeps_metric_name(
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op: &TokenType,
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modifier: <a class="enum" href="https://doc.rust-lang.org/1.98.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&BinModifier>,
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) -> <a class="primitive" href="https://doc.rust-lang.org/1.98.1/std/primitive.bool.html">bool</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Whether the metric name survives a binary operation; see
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<a href="fn.binary_metric_name_side.html" title="fn servers::http::prometheus::binary_metric_name_side"><code>binary_metric_name_side</code></a> for the operand that supplies it.</p>
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<p>Follows Prometheus’ <code>shouldDropMetricName</code> and <code>resultMetric</code>: set operators
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and comparisons keep the name, while arithmetic operators drop it. A
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comparison also drops it when it returns a bool or is a one-to-one
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<code>on(...)</code> match that does not keep <code>__name__</code> or an <code>ignoring(...)</code> match
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that excludes it. Prometheus keeps only the <code>on(...)</code> labels or deletes the
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<code>ignoring(...)</code> labels for one-to-one matches.</p>
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</div></details></section></div></main></body></html> |