forked from docs/doc-exports
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: zhengxiu <zhengxiu@huawei.com> Co-committed-by: zhengxiu <zhengxiu@huawei.com>
150 lines
21 KiB
HTML
150 lines
21 KiB
HTML
<a name="EN-US_TOPIC_0000001938218508"></a><a name="EN-US_TOPIC_0000001938218508"></a>
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<h1 class="topictitle1">Setting Alarm Alerting via SMN for an Elasticsearch Cluster</h1>
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<div id="body0000001564906577"><p id="EN-US_TOPIC_0000001938218508__p154712017694">This topic describes how to use the open-source Open Distro alarm plugin to configure alarm alerting via the Simple Message Notification (SMN) service for Elasticsearch clusters in Kibana.</p>
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<div class="section" id="EN-US_TOPIC_0000001938218508__section148521314566"><h4 class="sectiontitle">Scenario Description</h4><p id="EN-US_TOPIC_0000001938218508__p1795434116126">By default, CSS installs the open-source Open Distro alarm plugin (opendistro_alerting) for Elasticsearch clusters of versions 7.6.2 and 7.10.2. This plugin has three components: Dashboard, Monitors, and Destinations. You can configure alarm alerting via SMN using the Destinations component. When using the Open Distro alarm plugin, an Elasticsearch cluster needs to send notifications via SMN. This requires service authorization, the purpose of which is to allow CSS to access other cloud resources, such as SMN, through agency, so that alarms generated for Elasticsearch clusters can be sent via SMN notifications. For details about the Open Distro alarm plugin, see <a href="https://opendistro.github.io/for-elasticsearch-docs/docs/alerting/monitors/" target="_blank" rel="noopener noreferrer">Open Distro Monitors</a>.</p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001938218508__section1460419465720"><h4 class="sectiontitle">Constraints</h4><p id="EN-US_TOPIC_0000001938218508__p1167212479617">By default, the open-source Open Distro alarm plugin is installed only in Elasticsearch 7.6.2 and Elasticsearch 7.10.2. Therefore, only these clusters support this feature.</p>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001938218508__section14330827195719"><a name="EN-US_TOPIC_0000001938218508__section14330827195719"></a><a name="section14330827195719"></a><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0000001938218508__ul15995161333815"><li id="EN-US_TOPIC_0000001938218508__li181181516143812">You have created a topic on the SMN console.</li><li id="EN-US_TOPIC_0000001938218508__li3437173419585">You have obtained CSS administrator account. The account has the permissions to access CSS and view the agency list, create agencies, and grant permissions to agencies.</li></ul>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001938218508__section898402435419"><h4 class="sectiontitle">Authorizing Users to Use SMN</h4><ol id="EN-US_TOPIC_0000001938218508__ol129851924165413"><li id="EN-US_TOPIC_0000001938218508__li15996128141913"><span id="EN-US_TOPIC_0000001938218508__ph6996138201911">Log in to the CSS management console.</span><p id="EN-US_TOPIC_0000001938218508__p1133426131914">You must log in using a CSS administrator account.</p>
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</li><li id="EN-US_TOPIC_0000001938218508__li791816471844">In the navigation pane, choose <strong id="EN-US_TOPIC_0000001938218508__b190079240335456">Service Authorization</strong>.</li><li id="EN-US_TOPIC_0000001938218508__li1489192120510">On the <strong id="EN-US_TOPIC_0000001938218508__b8272656035456">Service Authorization</strong> page, click <strong id="EN-US_TOPIC_0000001938218508__b214621698935456">Create Agency</strong>. In the dialog box displayed, confirm that the agency is successfully created.<ul id="EN-US_TOPIC_0000001938218508__ul146461324333"><li id="EN-US_TOPIC_0000001938218508__li146467219336">If an agency has been created, "css_smn_agency exist, no need to created." is displayed in the upper right corner.</li><li id="EN-US_TOPIC_0000001938218508__li18471105833310">If you do not have the permission to create an agency, an error message will be displayed in the upper right corner indicating "no permission", in which case, check that the administrator account has been assigned the IAM permission.</li></ul>
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</li></ol>
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</div>
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<div class="section" id="EN-US_TOPIC_0000001938218508__section116811923135817"><h4 class="sectiontitle">Setting Alarm Notifications via SMN</h4><ol id="EN-US_TOPIC_0000001938218508__ol1689223416583"><li id="EN-US_TOPIC_0000001938218508__li113651842134713"><span id="EN-US_TOPIC_0000001938218508__ph266016103206">Log in to the CSS management console.</span><p id="EN-US_TOPIC_0000001938218508__p155393338209">Log in using an account with CSS permissions.</p>
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</li><li id="EN-US_TOPIC_0000001938218508__en-us_topic_0000002271391393_li4250043448">In the navigation pane on the left, choose <span class="uicontrol" id="EN-US_TOPIC_0000001938218508__uicontrol157122700985146"><b>Clusters > Elasticsearch</b></span>.</li><li id="EN-US_TOPIC_0000001938218508__en-us_topic_0000002271391393_en-us_topic_0000001268154521_li6012554340">In the cluster list, find the target cluster, and click <strong id="EN-US_TOPIC_0000001938218508__b109804217085740">Kibana</strong> in the <strong id="EN-US_TOPIC_0000001938218508__b119882264385740">Operation</strong> column to log in to the Kibana console.</li><li id="EN-US_TOPIC_0000001938218508__li121221820173920">On the Kibana page, choose <strong id="EN-US_TOPIC_0000001938218508__b867311351812">Open Distro for Elasticsearch</strong> > <strong id="EN-US_TOPIC_0000001938218508__b583213371319">Alerting</strong> in the navigation pane on the left.</li><li id="EN-US_TOPIC_0000001938218508__li10273150152314"><a name="EN-US_TOPIC_0000001938218508__li10273150152314"></a><a name="li10273150152314"></a>Create an SMN destination to send alert messages.<ol type="a" id="EN-US_TOPIC_0000001938218508__ol691362115234"><li id="EN-US_TOPIC_0000001938218508__li182481829175719">On the <strong id="EN-US_TOPIC_0000001938218508__b1321134818117">Alerting</strong> page, click the <strong id="EN-US_TOPIC_0000001938218508__b859965115115">Destinations</strong> tab and click <strong id="EN-US_TOPIC_0000001938218508__b88830551413">Add destination</strong> to configure destination information.
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001938218508__table15618122633118" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Destinations parameter description</caption><thead align="left"><tr id="EN-US_TOPIC_0000001938218508__row12618826173111"><th align="left" class="cellrowborder" valign="top" width="30%" id="mcps1.3.6.2.5.1.1.4.2.3.1.1"><p id="EN-US_TOPIC_0000001938218508__p96181926133112">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="70%" id="mcps1.3.6.2.5.1.1.4.2.3.1.2"><p id="EN-US_TOPIC_0000001938218508__p1361962618318">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="EN-US_TOPIC_0000001938218508__row16619162617318"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p76194264318">Name</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p661913261318">User-defined destination name</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row106192026203115"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p76196269311">Type</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p4619122653112">Retain the default value <strong id="EN-US_TOPIC_0000001938218508__b47218121622">SMN</strong>.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row1061917268317"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p9619182617312">Topic</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.5.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p1261972616310">Select the SMN topic you have created in <a href="#EN-US_TOPIC_0000001938218508__section14330827195719">Prerequisites</a> for sending alarm messages.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="fignone" id="EN-US_TOPIC_0000001938218508__fig421554871617"><span class="figcap"><b>Figure 1 </b>Add destination</span><br><span><img id="EN-US_TOPIC_0000001938218508__image15215448161616" src="figure/en-us_image_0000001938218852.png"></span></div>
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</li><li id="EN-US_TOPIC_0000001938218508__li523715123165">Click <strong id="EN-US_TOPIC_0000001938218508__b55567461524">Create</strong> to return to the destination list. If the created SMN destination is displayed in the list, the creation is complete.<div class="fignone" id="EN-US_TOPIC_0000001938218508__fig1833115352112"><span class="figcap"><b>Figure 2 </b>Destination list</span><br><span><img id="EN-US_TOPIC_0000001938218508__image123335313212" src="figure/en-us_image_0000001938378228.png"></span></div>
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</li></ol>
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</li><li id="EN-US_TOPIC_0000001938218508__li435962341913">Create a monitoring task and configure the alarm triggering condition and monitoring frequency.<ol type="a" id="EN-US_TOPIC_0000001938218508__ol1169518450279"><li id="EN-US_TOPIC_0000001938218508__li16328172810195">Click the <strong id="EN-US_TOPIC_0000001938218508__b155301416033">Monitors</strong> tab on the <strong id="EN-US_TOPIC_0000001938218508__b195739181732">Alerting</strong> page and click <strong id="EN-US_TOPIC_0000001938218508__b396910211139">Create monitors</strong> to configure monitoring information.
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001938218508__table212044012329" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Monitor parameters</caption><thead align="left"><tr id="EN-US_TOPIC_0000001938218508__row11201140103215"><th align="left" class="cellrowborder" valign="top" width="30%" id="mcps1.3.6.2.6.1.1.4.2.3.1.1"><p id="EN-US_TOPIC_0000001938218508__p1012074023215">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="70%" id="mcps1.3.6.2.6.1.1.4.2.3.1.2"><p id="EN-US_TOPIC_0000001938218508__p14120154063217">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="EN-US_TOPIC_0000001938218508__row312034020327"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p312014063213">Monitor name</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p212018404323">User-defined monitor name</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row212064083211"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p18860103963311">Monitor state</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p19120140203215">Monitoring status. You are advised to keep this function enabled.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row1312017409322"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p2121114023211">Method of definition</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p281462319339">Select a method to define monitoring. You are advised to use <strong id="EN-US_TOPIC_0000001938218508__b11359819191710">Define using extraction query</strong>.</p>
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<ul id="EN-US_TOPIC_0000001938218508__ul11224133817720"><li id="EN-US_TOPIC_0000001938218508__li922412381574"><strong id="EN-US_TOPIC_0000001938218508__b55065226178">Define using visual graph</strong>: use visualized query statement</li><li id="EN-US_TOPIC_0000001938218508__li722419381179"><strong id="EN-US_TOPIC_0000001938218508__b1464332481714">Define using extraction query</strong>: use specific query statement</li></ul>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row13103195963314"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p15104259153315">Index</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p10104135943313">Index to be monitored</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row15444195973311"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p17444175953310">Time field</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p208932171413">When <strong id="EN-US_TOPIC_0000001938218508__b188217387180">Define using visual graph</strong> is selected, select a time field and define counting parameters such as <strong id="EN-US_TOPIC_0000001938218508__b484341218197">count</strong>.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row1068417593333"><td class="cellrowborder" valign="top" width="30%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p12684259173315">Frequency</p>
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</td>
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<td class="cellrowborder" valign="top" width="70%" headers="mcps1.3.6.2.6.1.1.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p0684145963311">Select the monitoring frequency and set the monitoring interval. The options include:</p>
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<ul id="EN-US_TOPIC_0000001938218508__ul19911175713115"><li id="EN-US_TOPIC_0000001938218508__li191175710118"><strong id="EN-US_TOPIC_0000001938218508__b5547142942318">By interval</strong></li><li id="EN-US_TOPIC_0000001938218508__li791175721116"><strong id="EN-US_TOPIC_0000001938218508__b669483112230">Daily</strong></li><li id="EN-US_TOPIC_0000001938218508__li991165751112"><strong id="EN-US_TOPIC_0000001938218508__b2316143332318">Weekly</strong></li><li id="EN-US_TOPIC_0000001938218508__li69110573118"><strong id="EN-US_TOPIC_0000001938218508__b175461236172318">Monthly</strong></li><li id="EN-US_TOPIC_0000001938218508__li1291105710111"><strong id="EN-US_TOPIC_0000001938218508__b18116424142612">Custom cron expression</strong></li></ul>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</li><li id="EN-US_TOPIC_0000001938218508__li103721932193717">Click <strong id="EN-US_TOPIC_0000001938218508__b1532663992619">Create</strong>. The <strong id="EN-US_TOPIC_0000001938218508__b15617055272">Create trigger</strong> page is displayed. </li><li id="EN-US_TOPIC_0000001938218508__li107781049123811">On the <strong id="EN-US_TOPIC_0000001938218508__b1217372476">Create trigger</strong> page, set the alarm triggering conditions and actions to be triggered.
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001938218508__table75101458390" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Trigger parameters</caption><thead align="left"><tr id="EN-US_TOPIC_0000001938218508__row115103454395"><th align="left" class="cellrowborder" valign="top" width="29.959999999999997%" id="mcps1.3.6.2.6.1.3.2.2.3.1.1"><p id="EN-US_TOPIC_0000001938218508__p15101845123916">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="70.04%" id="mcps1.3.6.2.6.1.3.2.2.3.1.2"><p id="EN-US_TOPIC_0000001938218508__p45101745103918">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="EN-US_TOPIC_0000001938218508__row15510245103917"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p1512115333913">Trigger name</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p115101245113911">User-defined trigger name</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row10510945123914"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p1512117537397">Severity level</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p7510194533919">Sensitivity of a trigger, that is, the number of alarms that are triggered before an alarm message is sent. <span class="parmvalue" id="EN-US_TOPIC_0000001938218508__parmvalue7612182132513"><b>1</b></span> indicates the highest sensitivity.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row391914323362"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p179191732133610">Trigger condition</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p1891953220366">Trigger condition. An alarm is triggered when the trigger condition is hit.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row12510164515397"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p3120115315391">Action name</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p55101245133919">Name of a trigger action</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row5510164514391"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p912025313399">Destination</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p1510745153914">Select the SMN destination created in section <a href="#EN-US_TOPIC_0000001938218508__li10273150152314">5</a>.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row651054583912"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p1512055353913">Message subject</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p135101145113911">Title of the alarm message. This parameter is required only when Elasticsearch clusters of version 7.10.2 is used.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row17510845103915"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p7119115311396">Message</p>
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</td>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p1498744018384">Body of an alarm message. By default, the subject and body are defined when the destination is an email address.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001938218508__row1850195216417"><td class="cellrowborder" valign="top" width="29.959999999999997%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001938218508__p17501152124119">Action throttling</p>
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<td class="cellrowborder" valign="top" width="70.04%" headers="mcps1.3.6.2.6.1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001938218508__p15506523417">Message sending frequency. It limits the number of notification messages can be received in a specified period.</p>
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<p id="EN-US_TOPIC_0000001938218508__p145154674413">For example, if this parameter is set to 10 minutes, SMN sends only one alarm notification in the next 10 minutes even if the trigger condition is hit for multiple times. After 10 minutes, SMN sends another alarm notification if the alarm condition is met.</p>
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<div class="fignone" id="EN-US_TOPIC_0000001938218508__fig1342217084217"><span class="figcap"><b>Figure 3 </b>Setting the destination of a trigger action</span><br><span><img id="EN-US_TOPIC_0000001938218508__image1742215017426" src="figure/en-us_image_0000001965497429.png"></span></div>
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</li><li id="EN-US_TOPIC_0000001938218508__li9544112116446">Click <strong id="EN-US_TOPIC_0000001938218508__b151901858183015">Send test message</strong>. If a subscriber receives an email, as shown in <a href="#EN-US_TOPIC_0000001938218508__fig341274195412">Figure 5</a>, the trigger is configured successfully.<div class="fignone" id="EN-US_TOPIC_0000001938218508__fig2832329115114"><span class="figcap"><b>Figure 4 </b>Sending test messages</span><br><span><img id="EN-US_TOPIC_0000001938218508__image1783342914517" src="figure/en-us_image_0000001965417225.png"></span></div>
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<div class="fignone" id="EN-US_TOPIC_0000001938218508__fig341274195412"><a name="EN-US_TOPIC_0000001938218508__fig341274195412"></a><a name="fig341274195412"></a><span class="figcap"><b>Figure 5 </b>Email notification</span><br><span><img id="EN-US_TOPIC_0000001938218508__image9412843542" src="figure/en-us_image_0000001965497421.png"></span></div>
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</li><li id="EN-US_TOPIC_0000001938218508__li1545051111553">Click <strong id="EN-US_TOPIC_0000001938218508__b97871442202616">Create</strong> to return to the Monitor details page.</li></ol>
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</li></ol>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="css_01_0016.html">Elasticsearch Cluster Monitoring and Log Management</a></div>
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