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class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->HertzBeat<!-- --> <b>v1.3.x</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/help/alert_threshold_expr">latest version</a></b> (<!-- -->v1.5.x<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">help</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">threshold</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Threshold trigger expression</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: v1.3.x</span><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>Threshold trigger expression</h1></header><blockquote><p>When we configure the threshold alarm, we need to configure the threshold trigger expression. The system calculates whether to trigger the alarm according to the expression and the monitoring index value. Here is a detailed introduction to the use of the expression. </p></blockquote><h4 class="anchor anchorWithStickyNavbar_LWe7" id="operators-supported-by-expressions">Operators supported by expressions<a href="#operators-supported-by-expressions" class="hash-link" aria-label="Direct link to heading" title="Direct link to heading"></a></h4><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#393A34;--prism-background-color:#f6f8fa"><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:#393A34"><span class="token plain">equals(str1,str2) </span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">==</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"><</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain"><=</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">></span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">>=</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">!=</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">( )</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">+</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">-</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">&&</span><br></span><span class="token-line" style="color:#393A34"><span class="token plain">||</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 class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path 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 class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Rich operators allow us to define expressions freely.<br> |
