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",[555,609,557],{},".",[612,613,615],"h2",{"id":614},"why","Why",[617,618,619,627,636],"ul",{},[620,621,622,626],"li",{},[623,624,625],"strong",{},"Triage at the receiver."," Quickly distinguish evlog traffic from other clients in the receiving system's logs.",[620,628,629,632,633,635],{},[623,630,631],{},"Track adapter usage and version drift."," Roll out a new evlog version and watch the ",[555,634,557],{}," distribution change centrally.",[620,637,638,641,642,644],{},[623,639,640],{},"Debug a specific drain."," Filter by ",[555,643,570],{}," to isolate one adapter's behavior in a sea of incoming requests.",[612,646,648],{"id":647},"reading-the-version","Reading the version",[527,650,651,652,655],{},"Both constants are exported from ",[555,653,654],{},"evlog\u002Ftoolkit"," so your drain (or your receiver) can reference the canonical values:",[657,658,663],"pre",{"className":659,"code":660,"language":661,"meta":662,"style":662},"language-ts shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","import { EVLOG_USER_AGENT, EVLOG_VERSION } from 'evlog\u002Ftoolkit'\n\nconsole.log(EVLOG_VERSION)    \u002F\u002F → \"2.16.0\"\nconsole.log(EVLOG_USER_AGENT) \u002F\u002F → \"evlog\u002F2.16.0\"\n","ts","",[555,664,665,703,710,729],{"__ignoreMap":662},[666,667,670,674,678,682,685,688,691,694,697,700],"span",{"class":668,"line":669},"line",1,[666,671,673],{"class":672},"s7zQu","import",[666,675,677],{"class":676},"sMK4o"," {",[666,679,681],{"class":680},"sTEyZ"," EVLOG_USER_AGENT",[666,683,684],{"class":676},",",[666,686,687],{"class":680}," EVLOG_VERSION",[666,689,690],{"class":676}," }",[666,692,693],{"class":672}," from",[666,695,696],{"class":676}," '",[666,698,654],{"class":699},"sfazB",[666,701,702],{"class":676},"'\n",[666,704,706],{"class":668,"line":705},2,[666,707,709],{"emptyLinePlaceholder":708},true,"\n",[666,711,713,716,718,722,725],{"class":668,"line":712},3,[666,714,715],{"class":680},"console",[666,717,610],{"class":676},[666,719,721],{"class":720},"s2Zo4","log",[666,723,724],{"class":680},"(EVLOG_VERSION)    ",[666,726,728],{"class":727},"sHwdD","\u002F\u002F → \"2.16.0\"\n",[666,730,732,734,736,738,741],{"class":668,"line":731},4,[666,733,715],{"class":680},[666,735,610],{"class":676},[666,737,721],{"class":720},[666,739,740],{"class":680},"(EVLOG_USER_AGENT) ",[666,742,743],{"class":727},"\u002F\u002F → \"evlog\u002F2.16.0\"\n",[612,745,747],{"id":746},"overriding-from-a-custom-drain","Overriding from a custom drain",[527,749,750,751,757,758,761,762,765,766,761,768,771],{},"Adapters built with ",[752,753,754],"a",{"href":482},[555,755,756],{},"defineHttpDrain()"," automatically pass the drain ",[555,759,760],{},"name"," as ",[555,763,764],{},"source"," and the canonical ",[555,767,562],{},[555,769,770],{},"userAgent",". You don't need to think about it.",[527,773,774,775,778,779,781,782,784,785,787],{},"When you build a drain on top of ",[555,776,777],{},"httpPost"," from ",[555,780,654],{}," directly (e.g. for a fork with a different identity, or for a vendor that wants its own UA), pass ",[555,783,764],{}," and\u002For ",[555,786,770],{}," to override:",[657,789,791],{"className":659,"code":790,"language":661,"meta":662,"style":662},"import { httpPost } from 'evlog\u002Ftoolkit'\n\nawait httpPost({\n  url: 'https:\u002F\u002Fmy-platform.example.com\u002Fingest',\n  headers: { 'Content-Type': 'application\u002Fjson' },\n  body: '[]',\n  timeout: 5000,\n  label: 'my-platform',\n  source: 'my-platform',           \u002F\u002F sent as X-Evlog-Source\n  userAgent: 'my-fork\u002F1.0',        \u002F\u002F overrides the default User-Agent\n  \u002F\u002F userAgent: false,             \u002F\u002F suppress the header entirely\n})\n",[555,792,793,812,816,829,849,878,895,909,926,945,965,974],{"__ignoreMap":662},[666,794,795,797,799,802,804,806,808,810],{"class":668,"line":669},[666,796,673],{"class":672},[666,798,677],{"class":676},[666,800,801],{"class":680}," httpPost",[666,803,690],{"class":676},[666,805,693],{"class":672},[666,807,696],{"class":676},[666,809,654],{"class":699},[666,811,702],{"class":676},[666,813,814],{"class":668,"line":705},[666,815,709],{"emptyLinePlaceholder":708},[666,817,818,821,823,826],{"class":668,"line":712},[666,819,820],{"class":672},"await",[666,822,801],{"class":720},[666,824,825],{"class":680},"(",[666,827,828],{"class":676},"{\n",[666,830,831,835,838,840,843,846],{"class":668,"line":731},[666,832,834],{"class":833},"swJcz","  url",[666,836,837],{"class":676},":",[666,839,696],{"class":676},[666,841,842],{"class":699},"https:\u002F\u002Fmy-platform.example.com\u002Fingest",[666,844,845],{"class":676},"'",[666,847,848],{"class":676},",\n",[666,850,852,855,857,859,861,864,866,868,870,873,875],{"class":668,"line":851},5,[666,853,854],{"class":833},"  headers",[666,856,837],{"class":676},[666,858,677],{"class":676},[666,860,696],{"class":676},[666,862,863],{"class":833},"Content-Type",[666,865,845],{"class":676},[666,867,837],{"class":676},[666,869,696],{"class":676},[666,871,872],{"class":699},"application\u002Fjson",[666,874,845],{"class":676},[666,876,877],{"class":676}," },\n",[666,879,881,884,886,888,891,893],{"class":668,"line":880},6,[666,882,883],{"class":833},"  body",[666,885,837],{"class":676},[666,887,696],{"class":676},[666,889,890],{"class":699},"[]",[666,892,845],{"class":676},[666,894,848],{"class":676},[666,896,898,901,903,907],{"class":668,"line":897},7,[666,899,900],{"class":833},"  timeout",[666,902,837],{"class":676},[666,904,906],{"class":905},"sbssI"," 5000",[666,908,848],{"class":676},[666,910,912,915,917,919,922,924],{"class":668,"line":911},8,[666,913,914],{"class":833},"  label",[666,916,837],{"class":676},[666,918,696],{"class":676},[666,920,921],{"class":699},"my-platform",[666,923,845],{"class":676},[666,925,848],{"class":676},[666,927,929,932,934,936,938,940,942],{"class":668,"line":928},9,[666,930,931],{"class":833},"  source",[666,933,837],{"class":676},[666,935,696],{"class":676},[666,937,921],{"class":699},[666,939,845],{"class":676},[666,941,684],{"class":676},[666,943,944],{"class":727},"           \u002F\u002F sent as X-Evlog-Source\n",[666,946,948,951,953,955,958,960,962],{"class":668,"line":947},10,[666,949,950],{"class":833},"  userAgent",[666,952,837],{"class":676},[666,954,696],{"class":676},[666,956,957],{"class":699},"my-fork\u002F1.0",[666,959,845],{"class":676},[666,961,684],{"class":676},[666,963,964],{"class":727},"        \u002F\u002F overrides the default User-Agent\n",[666,966,968,971],{"class":668,"line":967},11,[666,969,970],{"class":727},"  \u002F\u002F userAgent: false,",[666,972,973],{"class":727},"             \u002F\u002F suppress the header entirely\n",[666,975,977,980],{"class":668,"line":976},12,[666,978,979],{"class":676},"}",[666,981,982],{"class":680},")\n",[612,984,986],{"id":985},"next-steps","Next steps",[617,988,989,999],{},[620,990,991,994,995,998],{},[752,992,993],{"href":482},"Custom Drains"," — ",[555,996,997],{},"defineHttpDrain"," injects identity headers automatically",[620,1000,1001,1004],{},[752,1002,1003],{"href":487},"Drain Pipeline"," — wrap any drain in batch + retry while keeping identity headers",[1006,1007,1008],"style",{},"html pre.shiki code .s7zQu, html code.shiki .s7zQu{--shiki-light:#39ADB5;--shiki-light-font-style:italic;--shiki-default:#89DDFF;--shiki-default-font-style:italic;--shiki-dark:#89DDFF;--shiki-dark-font-style:italic}html pre.shiki code .sMK4o, html code.shiki .sMK4o{--shiki-light:#39ADB5;--shiki-default:#89DDFF;--shiki-dark:#89DDFF}html pre.shiki code .sTEyZ, html code.shiki .sTEyZ{--shiki-light:#90A4AE;--shiki-default:#EEFFFF;--shiki-dark:#BABED8}html pre.shiki code .sfazB, html code.shiki .sfazB{--shiki-light:#91B859;--shiki-default:#C3E88D;--shiki-dark:#C3E88D}html pre.shiki code .s2Zo4, html code.shiki .s2Zo4{--shiki-light:#6182B8;--shiki-default:#82AAFF;--shiki-dark:#82AAFF}html pre.shiki code .sHwdD, html code.shiki .sHwdD{--shiki-light:#90A4AE;--shiki-light-font-style:italic;--shiki-default:#546E7A;--shiki-default-font-style:italic;--shiki-dark:#676E95;--shiki-dark-font-style:italic}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .swJcz, html code.shiki .swJcz{--shiki-light:#E53935;--shiki-default:#F07178;--shiki-dark:#F07178}html pre.shiki code .sbssI, html code.shiki .sbssI{--shiki-light:#F76D47;--shiki-default:#F78C6C;--shiki-dark:#F78C6C}",{"title":662,"searchDepth":705,"depth":705,"links":1010},[1011,1012,1013,1014],{"id":614,"depth":705,"text":615},{"id":647,"depth":705,"text":648},{"id":746,"depth":705,"text":747},{"id":985,"depth":705,"text":986},"Every drain request sent by evlog is tagged with User-Agent and X-Evlog-Source headers so receivers can identify and triage the traffic. Override or suppress them when your custom drain needs different identity.","md",[1018],{"label":993,"icon":484,"to":482,"color":1019,"variant":1020},"neutral","subtle",{},{"title":476,"icon":479},{"title":522,"description":1015},"gfvY7aCTYjht3OcMEXXfgha2PlhYsOnqpwm73GY9l_s",[1026,1028],{"title":472,"path":473,"stem":474,"description":1027,"icon":64,"children":-1},"Decide post-hoc whether to keep an event with full knowledge of its outcome (status, duration, errors). The opposite of head sampling — keep all errors and slow requests while throwing away healthy noise.",{"title":481,"path":482,"stem":483,"description":1029,"icon":484,"children":-1},"Build a drain for any backend without a built-in adapter — defineHttpDrain for HTTP destinations, defineDrain for any other transport. Standardized config resolution, retries, timeouts, and identity headers handled for you.",1785678944888]