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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="Constructs a new `Event`."><title>event in tracing - 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-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-263c88ec.css"></noscript><link rel="icon" href="https://raw.githubusercontent.com/tokio-rs/tracing/main/assets/favicon.ico"></head><body class="rustdoc macro"><!--[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="#">event</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/main/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing/index.html">tracing</a><span class="version">0.1.44</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">event</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate tracing</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"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="index.html">tracing</a></div><h1>Macro <span class="macro">event</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/tracing/macros.rs.html#615-1053">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! event {
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(name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(name: $name:expr, target: $target:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... };
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(name: $name:expr, target: $target:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(name: $name:expr, target: $target:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(name: $name:expr, target: $target:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(name: $name:expr, target: $target:expr, $lvl:expr, $($arg:tt)+) => { ... };
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(target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(target: $target:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(target: $target:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(target: $target:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... };
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(name: $name:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(name: $name:expr, parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(name: $name:expr, parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(name: $name:expr, parent: $parent:expr, $lvl:expr, $($arg:tt)+) => { ... };
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(name: $name:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(name: $name:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(name: $name:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(name: $name:expr, $lvl:expr, $($arg:tt)+ ) => { ... };
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(target: $target:expr, $lvl:expr, { $($fields:tt)* } ) => { ... };
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(target: $target:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(target: $target:expr, $lvl:expr, $($k:ident).+ = $($fields:tt)* ) => { ... };
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(target: $target:expr, $lvl:expr, $($arg:tt)+ ) => { ... };
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(parent: $parent:expr, $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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(parent: $parent:expr, $lvl:expr, $($k:ident).+ = $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, ?$($k:ident).+ = $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, %$($k:ident).+ = $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, $($k:ident).+, $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, %$($k:ident).+, $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, ?$($k:ident).+, $($field:tt)*) => { ... };
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(parent: $parent:expr, $lvl:expr, $($arg:tt)+ ) => { ... };
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( $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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( $lvl:expr, { $($fields:tt)* }, $($arg:tt)+ ) => { ... };
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($lvl:expr, $($k:ident).+ = $($field:tt)*) => { ... };
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($lvl:expr, $($k:ident).+, $($field:tt)*) => { ... };
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($lvl:expr, ?$($k:ident).+, $($field:tt)*) => { ... };
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($lvl:expr, %$($k:ident).+, $($field:tt)*) => { ... };
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($lvl:expr, ?$($k:ident).+) => { ... };
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($lvl:expr, %$($k:ident).+) => { ... };
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($lvl:expr, $($k:ident).+) => { ... };
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( $lvl:expr, $($arg:tt)+ ) => { ... };
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Constructs a new <code>Event</code>.</p>
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<p>The event macro is invoked with a <code>Level</code> and up to 32 key-value fields.
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Optionally, a format string and arguments may follow the fields; this will
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be used to construct an implicit field named “message”.</p>
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<p>See <a href="index.html#using-the-macros" title="mod tracing">the top-level documentation</a> for details on the syntax accepted by
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this macro.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::{event, Level};
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<span class="kw">let </span>data = (<span class="number">42</span>, <span class="string">"forty-two"</span>);
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<span class="kw">let </span>private_data = <span class="string">"private"</span>;
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<span class="kw">let </span>error = <span class="string">"a bad error"</span>;
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<span class="macro">event!</span>(Level::ERROR, %error, <span class="string">"Received error"</span>);
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<span class="macro">event!</span>(
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target: <span class="string">"app_events"</span>,
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Level::WARN,
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private_data,
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<span class="question-mark">?</span>data,
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<span class="string">"App warning: {}"</span>,
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error
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);
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<span class="macro">event!</span>(name: <span class="string">"answer"</span>, Level::INFO, the_answer = data.<span class="number">0</span>);
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<span class="macro">event!</span>(Level::INFO, the_answer = data.<span class="number">0</span>);</code></pre></div></div></details></section></div></main></body></html> |